1. Department of Psychiatry, Roozbeh Hospital, Tehran University of Medical Sciences, Tehran, Iran
2. Department of Geriatric Medicine, Ziaeian Hospital, Tehran University of Medical Sciences (TUMS), Tehran, Iran
3. Iranian National Center for Addiction Studies (INCAS), Tehran University of Medical Science, Tehran, Iran
4. Department of Sociology, Kharazmi University, Karaj, Iran
5. Psychiatry and Psychology Research Center, Roozbeh Hospital, Tehran University of Medical Sciences, Tehran, Iran
6. Department of Epidemiology and Biostatistics, School of Medicine, University of California, San Francisco, CA, USA