1 Department of Epidemiology, School of Public Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
2 Department of Public Health, School of Nursing and Midwifery, Managerial Epidemiology Research Center, Maragheh University of Medical Sciences, Maragheh, Iran. saeidsafiri@gmail.com.
3 Department of Epidemiology & Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran. saeidsafiri@gmail.com.