Designing a resilience model for pharmaceutical supply chain during crises: a grounded theory approach

Background During disasters or crises, the traditional models of supply chain encounter failure and skewedness under the inevitable and unknown pressures. The procurement and transformation of required equipment to the involved areas is considered as one of the main triggers of decreasing damages and losses during crisis. In this regard, a breakdown in pharmaceutical supply chain can lead to intensive, undesired consequences. Methods This was a qualitative study applying a grounded theory approach. The study was conducted with attending of 32 informant participants who were qualified in supply chain during natural disasters and crisis. In order to collect the data, deep semi-structured interviews were applied along with investigating the documents, observation, field notes and theoretical memos. For data analysis, a continuous comparison was used according to Corbin and Strauss method. Results Results of the study were categorized in 8 main categories as the main themes. “Wasting” appeared as the main factor of the resilience of pharmaceutical and consumable medical equipment supply chain. Wasting included two subthemes of loss of resources and wasting time. Conclusion In order to make resilience in pharmaceutical and consumable medical equipment during disasters, it is necessary to reinforce the various dimensions of the resilience model to increase the rate of supply chain responsiveness. This study particularly contributes to broadening and deepening our understanding of how to mitigate the risk of undesirable outcomes of pharmaceutical supply chain during the disasters or crises.


Background
The past few decades have been notable for major disruptions in supply chains [1]. It is estimated that in the first half of 2018, about 1069 disruption happened, which has been the highest rate in 3 years [2]. Catastrophic events such as the recent COVID-19 pandemic in 2020, hurricane Harvey in Houston in 2017, hurricane Maria in Puerto Rico in 2017, the 2010 eruption of a volcano in Iceland, and the 2011 Japanese tsunami caused profound damages to both private and public sectors [3]. Among them, pharmaceutical and medical device supply chain has been a very challenging issue worldwide and also has been one of the most prominent concerns of both policymakers and practitioners. The logic behind this concern is that these sort of products have to be provided at the

Open Access
Editorial responsibility Zaheer Babar, University of Huddersfield, UK.  14:115 right time with the reasonable price [4]. For this reason, all stakeholders try to do their best to supply such products with less defect. Obviously, this would be more highlighted in the unexpected situations where this supply chain is substantially influenced by external forces. Natural disasters are very common examples of these situations that has to be handled very fast; otherwise, it causes vast damages to both health status of a society and the environment.
At the time of disaster, the supply chain acts as a neural network, and traditional models of it fail to work properly because of the inevitable and unknown pressures. Failure in the supply chain may have an effect on all the product processes and lead to lose the capitals, increase the costs and reduce the market share along with customer dissatisfaction and brand damages. Tsunami and the earthquake in Japan along with the flood and nuclear event in Thailand have shown that how an event in a limited point of the world can damage half of the supply chains in the whole world. According to Tang (2006), supply chain risk management (SCRM) is 'the management of supply chain risks through coordination or collaboration among the supply chain partners so as to ensure continuity' [5]. It is largely argued that SCRM is intended to identify, assess, and monitor the risks for potential disruption in a supply chain continuum mitigating the negative consequence of disruptions on supply chain operations [6]. Supply chain risks are generally classified into disruption risks and operational risks [7]. As Mellat Parast and Shekarian (2020) note, disruption risks typically limit a supply chain system; they may originate man-made or natural events disasters such as hurricanes [8]. In this regard, in order to increase the resilience and flexibility against disasters, the organizations need to have new tools to assess the risk, supervise the supply chain as well as modeling [9]. It is important to remember that, this issue is wider than an organization's role and requires a continuous improvement and supervision via related organizations in the supply chain [10]. The resilience of the supply chain not only leads to improve the efficiency and decrease the risk, but also causes to predict and moderate the inevitable events related to the supply chains quickly [9].
In this regard, pharmaceuticals are among vital necessities for patients all over the world and should be offered to them in all conditions as well as disasters and hazards [11]. According to the evidence, procurement of pharmaceuticals and transporting them to the damaged areas via supply chain is considered as one of the major issues of decreasing damages and injuries during disasters [12]. On the other hand, lack of pharmaceuticals is a huge problem in normalization of the disasters and those who leave their houses during crisis may have a severe need to treatment services and medicines as well [13]. At the same time, predicting the rate of pharmaceuticals consumption and the adequate ordering at the right time are considered as basic principles of health care [14].
While the procurement of consumable medical equipment and pharmaceuticals are among one of the vital priorities in developing countries [15], the challenge of scarcity in medical equipment and supply chain management in health scope can be more sensitive and with more fatal consequences [16]. It will be obvious that during disasters including a contagious outbreak, an industrial accident, a natural disaster, a man-made or terrorist occurrence, the importance of access to pharmaceuticals and consumable medical equipment becomes highlighted [17].
In sum of what was said, an efficient supply chain should be able to offer the pharmaceuticals in a rational manner and acceptable quality in a minimum possible time and the optimal costs [18]. Such this supply chain should have the potentiality of encountering the disasters and the flexibility of movement to the appropriate condition [19]. In this regard, some items can lead to the improvement and appropriate response of the pharmaceutical supply chain during disasters the same as: predicting the dynamic demand, flexible allocating of the resources, determining the shelf life of the consumable items, disseminating and sharing the information and developing the business models for minimizing corruption and fraud [17].
In our knowledge, most of the studies on supply chain in health care systems are focused on the normal conditions, and there are only limited numbers concentrated on health-related supply chain management during disasters. This study aims to propose a customized, resilient supply chain model for pharmaceuticals and consumable medical devices during disasters.

Study design
This was a qualitative study applying grounded theory approach with Strauss and Corbin's philosophical orientation [20]. The aim of the study was to determine the process and the model of resilience in pharmaceuticals and consumable medical equipment supply chain during natural disasters. Strauss and Corbin's philosophical orientation was applied rather than those of Glaser's and Charmaz's. Grounded theory has several distinct methodological categories: traditional GT associated with Glaser; evolved GT associated with Strauss, Corbin and Clarke; and constructivist GT associated with Charmaz. While there are commonalities among all generations of GT, there are factors that distinguish them such as the philosophical position of the researcher; the use of literature; and the approach to coding, and analysis and  [21].

Participants
The study population consists of those managers and staff affiliated in the organizations with the mission of pharmaceuticals and consumable medical equipment procurement and with the experience and presence of working in the natural disasters` scenes. 32 people were included in the study including 4 specialists with the degree of PhD, 9 medical doctors, 7 pharm doctors, 7 allied medicine experts and 5 participants with management education. The participants of the study first were selected purposefully among food and drug deputy of those Iranian Universities of Medical Sciences that were experienced any kinds of natural disasters the same as flood, earthquake, etc. After fulfilling 6 interviews and analyzing the achieved data, according to the theoretical sampling in grounded theory approach [22], data directed us to conduct interviews with the staff affiliated with Red Crescent Population, military organizations, insurance companies and distributors of pharmaceuticals and consumable medical equipment. In accordance with the lack of new codes in 5 latest interviews, the researchers received the saturation level and the sampling process was stopped. The average age of the participants were 43 years from the minimum of 29 to the maximum range of 54 years. The educational level of the participants was diverse from Bachelor degree to specialized PhD on different majors and specialized education in medicine and pharmacology and pharmacy. In order to catch a better understanding of the resilience of pharmaceuticals and consumable medical equipment supply chain, we attempted to select the participants from a vast spectrum of those people who were engaged in recent national natural disasters the same as Bam earthquake (2003), East Azerbaijan earthquake (2012) and Kermanshah earthquake (2018) as well as Khorramabad flood (2019). In this regard, the first interview was conducted with a person who had an experience of attendance at the scene of disaster and then he was wanted to introduce the other informants with the similar experiences. So the sampling process was started purposefully and it was continued theoretically.

Data collection
Deep and semi-structured interviews were applied. Written informed consent was obtained from all the participants and all the interview sessions were recorded. The interview protocol was prepared according to the aim of the studies and after conducting two pilot open interviews with two experts who were not mentioned as the main participants. After analyzing the content of the aforementioned pilot interviews, the initial draft of the interview protocol was developed and the meaningfulness and robustness of the questions were verified via two random interviews which were not included in the final analysis. The interview sessions were started with an open question: "what was your experience from pharmaceuticals and consumable medical equipment during disasters like?" then according to the participant's descriptions, the probing questions were conducted. The interview protocol was then re-organized according to extracted categories from the previous interviews. The mean of the interview sessions was about 45 min and the duration of each interview session according to the condition and time of the participants was varied between 30 and 80 min. Each participant was interviewed between 1 or 2 times. Complementary interviews were conducted by phone and sometimes in a face to face condition in order to achieve more clarification and decrease the ambiguities. All the interviews were implemented during September 2018 to January 2020 in a period of 17 months.

Data analysis
For data analysis, constant comparative method suggested by Strauss and Corbin was used including three stages of open coding, axis coding and selective coding [23]. For the open coding, first the recorded files of the interviews were changed to transcript and the whole body was reviewed several times and line by line then the main meaningful units and concepts in each line or paragraph were extracted and coded. The coding process was conducted applying the own words of the participants or the interpretations of the researchers from the original concepts extracted from the data. In this step, an initial categorization of the codes was made and 792 initial codes were extracted. Then after going through the constant comparative analysis, the initial codes were decreased to 209 final codes that finally were categorized in 30 subthemes and 8 main themes. The data analysis process was done applying MAX QDA-2010.
In order to assure the rigor and validity of the data, four Lincoln and Guba's criteria were applied including credibility, transferability, dependability and conformability [24]. Long-term involving of the researchers with the data led to achieve the credibility. Triangulation technique was another approach that was applied for better comprehending of the process and increasing data credibility. At the same time, using audio and video documents, field observations, filed notes and memos were applied. The sampling diversity, applying member check technique for reviewing the transcripts by the participants, peer reviewing the extracted codes by the colleagues and experts all over the research process and finally, external audit at the end of the research were among other techniques using for assuring conformability. Also, in order to achieve procedural precision, data management strategies and demonstrable procedural logic, the eight steps of developing grounded theory enhanced by Manuj et al.
(2012) was applied as follows: explanation of the phenomenon, establishment of the appropriateness of the grounded theory methodology, selection of the context, selection of the data sources, development of the interview protocol, data collection and coding, diagraming concepts and developing the theory and comparing and evaluating the theory [25]. Figure 1 illustrates the research design framework, summarizing the processes used in the study.

Results
Data analysis included 792 initial codes that after a continuous comparison of these codes and the raw data considering similarity and differences, the similar codes were categorized and labeled in a category. 209 categories were created and after integration they were summarized in 30 subthemes and 8 themes ( Table 1). The present results have led to "wasting" of the pharmaceuticals and consumable medical equipment during natural disasters as the main phenomenon of the research (Fig. 2).

Disaster management structure
Disaster management structure is considered as an important determinant in managing pharmaceuticals and consumable medical equipment supply chain during disasters. This main theme contains 5 subthemes of infrastructure standards, health system potentials, appropriate designing of the structures, supply chain stewardship, unique command and initial actions. About the structure standards, one of the participants declared that: "If the health centers encountered the earthquake, they would not have enough consistency. In the experience of Sarpol-e Zahab earthquake those governmental buildings of the health centers had sufficient consistency against those of private or charity sectors that do not have so much solidity" [P 3 ].
About utilization of the health system potentialities, another participant added: "One strength point in our country is the existence of healthcare centers and hospitals with near dis- Appropriate designing as another subtheme was mentioned here: "Right at the earthquake night a comprehensive team of medical university and drug and food deputy was attended as a disaster in governors' office but the promptitude was not enough. It seems that the present structure does not have enough efficiency and should be redesigned" [P 23 ].
Kermanshah earthquake has implied the importance of unique command and stewardship of pharmaceutical and consumable medical equipment during disasters. In this regard, a participant said: "In early 24 h the needed structures were made and food and drug deputy was assigned as the steward of medicine and medical equipment's distribution to the damaged areas" [P 17 ].

Information management
Information in disasters can help to identify the local condition and problems in order to assess the needs and better management of supply chain. The related subthemes in this regard were: comprehensive information of the managers, appropriate need assessment and creating an integrated information system.
Comprehensive information of the managers considers very important during disasters and should be reached via training the managers with principles of disasters and consistency of the management. One participant declared that: "A person should be responsible of a supply chain that has enough experience and is aware of the process. Such a person can act more rapidly than those who do not have necessary experience and specialty" [P5].
According to the present results, inefficient structure of need assessment was an obvious problem in Kermanshah earthquake. A participant said: "During disasters, food and drug deputy as an agent of Ministry of health should assess the pharmaceutical needs and allocate local and national resources to these requirements, but unfortunately this is not happened in reality" [P 7 ]. An integrated information system is among the most significant information management principles during disasters. A participant clarified: "There was lack of integrated information system and unique management. The only thing that we really required was a management unit that can integrate the information with online monitoring, assess daily needs and plan for them…" [P 12 ].

Supply chain supervision
The need of supply chain supervision is obvious during disasters because of preventing probable abuse and readiness for encountering the contagious outbreaks. The related subthemes were as follows: pharmaceutical distributors' offending, controlling the probable outbreaks, controlling of the local condition and respecting safety principles. Regarding the conflict of interest toward the pharmaceuticals and medical equipment suppliers and distributors, the possibility of corruption and offending during disasters is not unexpected. In this regard, one of the participants clarified his experience: "If we do not check the delivered packages, the distributors may send whatever they want to the damaged areas without considering our needs. This condition may include fake recipients of the items, sending expired medicines or those with only a short shelf life" [P 3 ].
Controlling the epidemics in damaged areas regarding the geographical and critical circumstances of the field should be sped up. One participant declared:

"The needs may become different second by second according to the condition. In Sarpol-e-Zahab we have experienced epidemic crisis the same as prevalence of Cutaneous Leishmaniasis that needs extra requirements to be controlled the same as environmental interventions, poison spraying, etc. " [P 25 ].
Management and control of the local condition during crisis was among other important subthemes. One of the participants stated: "According to the climate and seasonal needs, the condition became different. The requirements of the damaged areas were greatly related to the type of crisis, severity of the disaster, the volume of collapse, the population and geographical conditions. All these variables can affect the management of the supply chain" [P 29 ].
Finally, health care workforces' respect of the safety principles during service delivery was among other subthemes. This subtheme becomes more considerable knowing the psychological problems affect the personnel during disasters. One participant remembered his experiences as follows: "In such a condition many of the healthcare workers may attempt to do some think because of their empathy and emotional forces, in this regard, if a shortage is occurred or a new problem is emerged, they may forget about the safety procedures and try to help under any circumstances" [P 11 ].

Cultural and social factors
One of the other determinant factors affecting the resilience of pharmaceutical and medical equipment supply chain is the sociocultural characteristics of the damaged areas that can affect the improvement of resource allocation and relief process or worsen the condition. According to the present results, level of literacy, employment, age, religion and the expectations and requests of the damaged people from the healthcare system are among the important sociocultural factors. In this regard, one of the participants added: "The cultural of the people in damaged areas is a determinant factor in disaster management. For example, if they have ever experienced similar condition or the level of expectations. Of course in rural and retrieved areas, it becomes manageable easier than the metropolitans with higher expectations of the citizens and their resistance to change" [P 19 ].

Planning
Planning was a key determinant that was considered in all the interviews. The participants indicate lack of planning in pharmaceutical and consumable medical equipment supply chain. The related subthemes were: non-integrated service delivery, importance of decisionmaking and necessity of planning.
The participants have claimed that healthcare system may experience a shock caused by the disaster. This shock can affect the potential of resilience of the system and may lead to non-integration and disorder. One participant said: "In many disasters as well as Bam, Bushehr, Azerbaijan and Kermanshah earthquakes, we have faced anarchy particularly in 2-3 initial days. This chaos can lead to the system's shock. So in this way we cannot have an integrated information system about the real needs, exact estimation of the damages and the The necessity of urgent and significant decisions is among main characteristics of critical conditions. But the present results indicate the wrong, delayed and arbitrary decisions in many situations. One participant noted: "unfortunately we always postpone the decisionmaking to the disaster condition rather than predicting and preparing before that. So in such an emergency condition we are forced to decide promptly and in a hurry" [P 21 ].
The participants have indicated the inefficiency and inappropriateness of their organizations' action plans for real crisis. One participant added: "we do not have a systematic national plan for disasters. We may conduct workshops and meetings but an executive plan is missing always. As a result, in disasters, the organizations act separately and according to their local instructions" [P 9 ].

Resource management
The present results have emphasized the importance of financial and manpower resources during natural disasters. The main subthemes here are as follows: resource shortage, supply chain management, donation management and workforce management. According to the participants, the access to health services may decrease regarding the type and severity of the crisis and shortages may be highlighted. One participant exemplified: "pharmaceutical system among all other health care sections allocate a considerable amount of costs so during disasters, the consumption of medicines and consumable medical equipment may increase and the shortages will be occurred" [P 16 ].
The participants have mentioned supply chain management as a determinant factor in resource management during disasters. A participant affiliated in a military organization clarified: "as an allied organization, we can help the healthcare organizations during disaster but our main responsibility is not health service delivery and we cannot procure all pharmaceuticals and medical equipment requirements" [P 13 ].
Another finding was donations. Some part of these gifts delivered from all over the country was not practical and necessary and some of them were over the needs. A participant said: "many of the donated items were out of our control and cannot be organized. For example, 20 packages of gloves were sent that we did not really need. Many other items that were donated from all over the country also were not needed and we did not even have the condition for their storage" [P 20 ].
About another subtheme, human resource management through supply chain, we should point to two sections of specialists' management and the management of the volunteers. A participant added: "If there was a documented plan for the actions along with the trained workforces, the problems could better be managed. We needed trained volunteers with adequate familiarity with the condition of damaged areas and their culture and even language" [P31].

Health service coverage
Health service coverage was divided to four related subthemes as follows: supply chain restrictions, health insurance coverage, healthcare system efficiency and access to health cares. According to the participants, supply chain restrictions included distributive restrictions and legal requirements. A participant said: "when we had 2 or 3 destinations for medicines, our logistic potentiality was decreased for appropriate distribution" [P13].
Increasing the costs of services during disasters requires a rapid intervention of insurance organizations. In this regard, another participant added: "We had all the services freely in the first month after earthquake, but in the second month, we tried to relate the population needs with their insurance coverage. Many of the injured people had an insurance coverage but unfortunately their needs were not reimbursed by the insurers and the Ministry of Health had to pay" [P 8 ].
Inefficiency of the healthcare system was among another subtheme that was made because of increasing in load of services and unneeded referrals. A participant pointed out: "the volume of patients was great during the earthquake and the other provinces helped us a lot. At the same time, collapse of health infrastructures imposed a great load of actions to our governmental and even private centers. All the surgeons were on call 24 hours… all of these along with the emotional and psychological dimensions led to system's inefficiency" [P11]. Transportation problems also had led to barriers in physical access to pharmaceuticals and medical equipment supply chain. One participant stated his experience as follows: "that night when we were on a way to deliver medicines and medical equipment to Sarpol-e-Zahab, the landside was happened and the rural ways were chocked. This collapsed the process of relief and unfortunately we missed that vital hours" [P 10 ].

Wasting
Wasting was the main and core determinant in the study. This was the most intellectual theme that joins all the other themes to each other. According to the participants, wasting includes all the waste and overuse that occurred in human resources, financial resources and time. In this regard, one of the participants emphasized on the wasting of financial and human resources as follows: "we had a good access to workforces and volunteers with high level of energy but unfortunately we could not utilize and manage these valuable sources" [P 5 ].
About financial wasting, another participant added: "although we have a rich country, we are not able and trained to save. In Kermanshah earthquake we really did not have serious resource shortages but the main problems were appeared in resource allocation" [P 17 ].
And finally, time wasting was among the other subthemes. A participant declared that: "we always act and decide in a hurry so we waist out main capital, time, if we were ready before disaster, we never behaved in a try and error way that caused wasting our golden time" [P 11 ].

Discussion
This study was aimed to determine the model of resilience in the supply chain of pharmaceuticals and consumable medical devices during natural disasters. Wasting was the main determinant theme of the study that is caused following the ambiguity in the supply chain stewardship, lack of unit command, lack of integrated information system, awareness of the managers, and non-integrated and fragmented services during disaster. During crisis, supply chain can encounter various problems in structure of the disaster management, planning, infrastructure standards, and comprehensive need assessment.
Other studies indicate the same results for example, it has been indicated a severe lack of coordination and preparedness against disasters inter and among rehabilitative centers. Such a condition can be a result of neglecting the rule of preparedness guidelines and a definite structure as a main coordinator any crisis [26]. Dash et al. (2013) have proposed an interactive model of supply chain during disaster, including strategic planning, coordination, resource allocation, information seeking, communication, collaboration, transportation, monitoring, costs, time, performance assessment and documentation of lessons learned [27]. It would be obvious that only in the condition of a near collaboration among the stated factors, a supply chain can be reacted appropriately during crisis. Similarly, a previous study in Finland has declared that using local relief infrastructures are among the best way of overcoming the critical situations [28]. It is claimed that a dollar cost in preparedness and infrastructure designing is equivalent to 3 dollars in response to disaster stage [29].
The management of the supply chain`s information systems is significant for collaborating and sharing the information among internal and external customers, suppliers, distributors, and other stakeholders [30]. According to the present results, information diversity among different organizations, incomplete statistics and information, inappropriate information infrastructures during disasters are among the integrated information system's problems. In this regard, some scholars have proposed a radio frequency identification (RFID) for inventory management and control and improvement of response system [31]. It is also claimed that RFID can be used for management and tracing of the packages and valuable products [32]. Some researchers have also stated that implementing of RFID can lead to optimized management of medicines and consumable medical devices inventories [33]. In order to achieve the highest level of the performance, supply chain strategies should be matched with the information systems' strategies [34].
Although the values related to information technology are related to both technological and managerial skills, the size of an organization, the previous success, uncertainty, support of high management, and power of stakeholders may affect supply chains [35].
During disasters, the possibility of offending, fake documentations and any kind of corruptions becomes highlighted, which requires the strongest supervision on the pharmaceutical supply chain. Meanwhile, in order to control the condition of the damaged regions and estimate the need for effective interventions,, some necessary factors should be considered, among them we can point to isolation, environmental health, vaccination consistency and the necessity of psychological interventions. outbreaks during disasters [36]. In addition, Gupta et al. have suggested a model of decision-making in selecting the best location for setting the health centers and implementing vaccinations during crisis [37]. As far as social and cultural determinants are concerned, life style of the damaged areas can highly affect the population`s expectations, and consequently, emotional reactions of the people and health care workers can make difficulties in service delivery during disasters. Hence, attention to the community health literacy and training the population to enable for encountering disasters via social media would be helpful. It seems that a long-term and systematic plan can lead to improving the social and cultural aspects of the population as well as education and appropriate correction interventions in the countries with the same setting like Iran. In addition, as indicated by Christopher and Jüttner (2000), it is so crucial to manage the relationship with other parts of supply chain to increase the efficiency the supply chain [38].
With respect to the importance of flexible and applied planning, a previous research has also emphasized on agile pharmaceutical chain that is forged by speed of delivery, planning, trust development, prioritization of the suppliers, and the performance assessment [39]. It is also concluded that natural disasters such as flood and earthquake can lead to the collapse of pharmaceutical supply, and identification of the vulnerable areas and implementing the pre-planned interventions were among the suitable solutions during the critical conditions [40].
Related to resource management, it is shown that the main reasons of low preparedness of hospital during disasters can be associated with human resources coordination and management [41]. Additionally, Kwon & Kim (2018) in south Korea have interpreted that any investing on preparedness stages is much more effective than costing for utilizing relief actions [42]. In a study conducted in China, it is demonstrated that an emergency supply chain needs to determine supply points, emergency logistic centers and demand points in order to respond quickly [43].
Access to health services and health centers, developing surge capacities and vast coverage of the damaged areas are among other results of the study. Insurance coverage can be a solution that should be considered to reach a comprehensive coverage of damaged populations. Along with these requirements, the legal restrictions of the supply chain should be considered. Deficiency in distribution chain among community as well as hospital pharmacies and the problems related to local distribution system should be considered as well. About the efficiency of the health care system, we also have to mention the high load of works in primary days right after the crisis and service delivery in a higher level than the personnel's potential capacity. It is mentioned that nurses as a main group of engaged staff do not have the sufficient level of preparedness and some of them did not train for disaster conditions [44].
The reduction of the health workers' productivity, useful application of volunteers and lack of attendance to the people's creativity and experiences are among the main implications of human capital wasting in this study. Furthermore, increasing the pert of recourses during the supply chain and high costings for storage are among the implications of physical resource wasting in the present study. Delays in preventive actions before crisis occurrence, hurried actions and wrong decisions during crisis and delayed sending of recourses, duplications and unnecessary activities in health service delivery are among other findings that lead to time wasting. Reduction or elimination of these factors may lead to achieve an agile supply chain. Some scholars have emphasized that allocating enough funds for personnel compensation, investing enough time and energy for surveillance of the supply chain and dissemination of update and ontime information are among the important pre-disaster actions that can considerably decrease the time, money and energy wastes [45]. Finally, it is shown that an appropriate supply chain should mention the proportion between simplicity and complexity and achieving maximum output with minimum input to be able to respond to critical conditions [46].

Conclusion
Results of the study have shown that in a resilience model of pharmaceutical and consumable medical devices supply chain during disasters, wasting of resources is being highlighted as a main determinant. Weak structure of health system disaster management, lack of planning at different levels and unclear information infrastructures may intensify the rate and scale of wasting during natural disasters. Increasing the rate of wasting in supply chain along with inappropriate expectations, indifferent managers, people's probable abuse of resources, offending of pharmaceutical distributors and hurried decisions can lead to different outcomes the same as inefficiency of health system, reduction of health service access and health insurance coverage. In order to increase the resilience of pharmaceutical and consumable medical devices supply chain during disasters, reinforcing the present model's dimensions should be taken for granted. Given the uncertainties and unexpected conditions that healthcare systems may face in the future, building on the grounded theory, this study provides them with a framework to deal with such situations in an efficient manner. In other words, the resilient model provided in this