1. Addictions and Concurrent Disorders Research Group, Institute of Mental Health, Department of Psychiatry, Faculty of Medicine University of British Columbia Vancouver British Columbia Canada
2. Department of Neuropsychiatry Tanta University Tanta Egypt
3. Complex Pain and Addiction Services Vancouver General Hospital Vancouver British Columbia Canada
4. Department of Psychiatry, University of British Columbia Faculty of Medicine Vancouver British Columbia Canada
5. Division of Adolescent Health and Medicine, Department of Pediatrics University of British Columbia, Faculty of Medicine Vancouver British Columbia Canada
6. BC Mental Health & Substance Use Services, Provincial Health Services Authority Vancouver British Columbia Canada
7. Psychiatric University Clinic Basel Basel Switzerland