1. Department of Biostatistics, Dr. Somervell Memorial CSI Medical College, Karakonam, Thiruvananthapuram, Kerala
2. Department of Psychiatry, Post Graduate Institute of Medical Education and Research, Dr. Ram Manohar Lohia Hospital, New Delhi, India
3. Department of Psychiatry and Genetics, University of Pittsburgh School of Medicine, Western Psychiatric Institute and Clinic, Pittsburgh, Pennsylvania, USA