1. Department of Psychiatry, National Drug Dependence Treatment Centre (NDDTC), All India Institute of Medical Sciences (AIIMS), New Delhi, India
2. Department of Psychiatry, International program in Addiction Studies, King′s College London, London, UK
3. Department of Psychiatry, International program in Addiction Studies, University of Adelaide, Adelaide, Australia
4. Department of Psychiatry, International program in Addiction Studies, Virginia Commonwealth University, Richmond, Virginia, USA