1. Drug De-addiction & Treatment Centre & Department of Psychiatry, Postgraduate Institute of medical Education & Research, Chandigarh, Chandigarh, India;
2. Department of Psychiatry, Indira Gandhi Medical College, Shimla, Himachal Pradesh, India;
3. Department of Psychiatry, IVY Hospital, Nawanshahr, Punjab, India;
4. Consultant Psychiatrist, Community Mental Health Clinic, Cumbria Northumberland Tyne and Wear Foundation NHS Trust, Molineux NHS Centre, Byker, Newcastle Upon Tyne, UK