1. HIV/STI Surveillance Research Centre, and WHO Collaborating Center for HIV Surveillance, Institute for Futures Studies in Health, Kerman University of Medical Sciences, Kerman, Iran
2. Social Determinants of Health Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
3. Department of Addiction Studies, School of Medicine, Shahroud University of Medical Sciences, Shahroud, Iran
4. Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, CA, USA