1. Health Policy Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
2. Faculty of Health, Health Sciences Research Center, Mazandaran University of Medical Sciences, Sari, Iran
3. Torbat Heydariyeh University of Medical Sciences, Torbat Heydariyeh, Iran
4. Gastroenterology and Liver Diseases Research Center, Baqiyatallah University of Medical Science, Tehran, Iran
5. Department of Epidemiology, Faculty of Health, Iran University of Medical Sciences, Tehran, Iran
6. Physiology Research Center (PRC), Kerman University of Medical Sciences, Kerman, Iran