Keivan Ranjbar1,2, Mohsen Moghadami3, Alireza Mirahmadizadeh4,5, Mohammad Javad Fallahi1,6, Vahid Khaloo7, Reza Shahriarirad1,2, Amirhossein Erfani1,2, Zohre Khodamoradi6,8, Mohammad Hasan Gholampoor Saadi2. 1. Thoracic and Vascular Surgery Research Center, Shiraz University of Medical Sciences, Shiraz, Iran. 2. Student Research Committee, Shiraz University of Medical Sciences, Shiraz, Iran. 3. Health Policy research center, Institute of Health, Shiraz University of Medical Sciences, Shiraz, Iran. moghadami@sums.ac.ir. 4. Health Policy research center, Institute of Health, Shiraz University of Medical Sciences, Shiraz, Iran. 5. Non-communicable Diseases Research Center, Shiraz University of Medical Sciences, Shiraz, Iran. 6. Department of Internal Medicine, Shiraz University of Medical Sciences, Shiraz, Iran. 7. Ali Asghar hospital, Shiraz University of Medical Sciences, Shiraz, Iran. 8. Shiraz Geriatric Research Center, Shiraz University of Medical Sciences, Shiraz, Iran.