1. Institute for Health and Social Policy; McGill University; Montreal Canada
2. French National Institute of Health and Medical Research, UMR 1027; Paul Sabatier University; Toulouse France
3. Observatoire Francais des Drogues et des Toxicomanies; Saint Denis France
4. French National Institute of Health and Medical Research U1178; Paris France
5. Service Médical du Rectorat; Toulouse France
6. Douglas Mental Health University Institute; Montreal Canada