Mostafa Shokoohi1, Afarin Rahimi-Movaghar2, Alireza Noroozi3, Mohammad Karamouzian4. 1. HIV/STI Surveillance Research Center, and WHO Collaborating Center for HIV Surveillance, Institute for Futures Studies in Health, Kerman University of Medical Sciences, Kerman, Iran. 2. Iranian National Center for Addiction Studies, Tehran University of Medical Sciences, Tehran, Iran. 3. Iranian National Center for Addiction Studies, Tehran University of Medical Sciences, Tehran, Iran; Neuroscience and Addiction Studies Department, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran. 4. HIV/STI Surveillance Research Center, and WHO Collaborating Center for HIV Surveillance, Institute for Futures Studies in Health, Kerman University of Medical Sciences, Kerman, Iran; School of Population and Public Health, Faculty of Medicine, University of British Columbia, Vancouver, V6T 1Z3 BC, Canada. Electronic address: karamouzian.m@alumni.ubc.ca.