1. Program of International Research and Training, National Drug and Alcohol Research Centre, School of Public Health and Community Medicine, University of New South Wales, Sydney, Australia
2. Stats Central, Mark Wainwright Analytical Centre, University of New South Wales, Sydney, Australia
3. Department of Biostatistics, Social Determinants of Health Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
4. Iranian National Centre for Addiction Studies, Tehran University of Medical Sciences, Tehran, Iran