M Sani1, E Ayubi2,3, S Khazaei4, K Mansori5,6. 1. School of Medicine, Zabol University of Medical Sciences, Zabol, Iran. 2. Department of Epidemiology, School of Public Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran. aubi65@gmail.com. 3. Department of Epidemiology & Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran. aubi65@gmail.com. 4. Department of Epidemiology, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran. 5. Social Determinants of Health Research Center, Kurdistan University of Medical Sciences, Sanandaj, Iran. 6. Department of Epidemiology, School of Public Health, Iran University of Medical Sciences, Tehran, Iran.