1. Drug De-addiction and Treatment Centre, Department of Psychiatry, Postgraduate Institute of Medical Education and Research, Madhya Marg, Sector 12 Chandigarh 160012, India
2. Department of Psychiatry, All India Institute of Medical Sciences, Virbhadra Road Shivaji Nagar, near Barrage, Sturida Colony, Rishikesh 249203, India
3. Department of Psychiatry, Indira Gandhi Medical College & Hospital, Ridge Sanjauli Rd, Lakkar Bazar, Shimla 171001, India