1. St Paul's General Specialized Hospital, PO Box 31657, Addis Ababa, Ethiopia
2. King's College London, Institute of Psychiatry, London, UK,
3. Department of Psychiatry, Addis Ababa University, Addis Ababa, Ethiopia
4. University of Toronto, Centre for Addiction and Mental Health, Toronto, Canada
5. Department of Psychiatry, Dartmouth Medical School, New Hampshire-Dartmouth Psychiatric Research Centre, Lebanon, USA