1. Institute of Clinical Psychology and Psychotherapy Technische Universität Dresden Dresden Germany
2. Centre for Interdisciplinary Addiction Research University of Hamburg Hamburg Germany
3. Department of Psychiatry, Medical Faculty University of Leipzig Leipzig Germany
4. Department of Psychosomatic Medicine and Psychotherapy University of Leipzig Leipzig Germany
5. Centre for Addiction and Mental Health Institute for Mental Health Policy Research Toronto ON Canada
6. Institute of Medical Science University of Toronto Toronto ON Canada
7. Campbell Family Mental Health Research Institute Centre for Addiction and Mental Health Toronto ON Canada