1 Department of Psychiatry and National Drug Dependence Treatment Centre, All India Institute of Medical Sciences (AIIMS), New Delhi, India.
2 Department of Psychiatry, Institute of Human Behaviour and Allied Sciences (IHBAS), New Delhi, India.
3 Corresponding author: Pratap Sharan, MD, PhD, Department of Psychiatry and National Drug Dependence Treatment Centre, All India Institute of Medical Sciences (AIIMS), Room 4080, 4th Fl, Teaching Block, AIIMS, New Delhi, India, 110029 ([email protected]).