1. Grup Recerca Addiccions Clínic (GRAC‐GRE) Institut d’Investigacions Biomèdiques August Pi I Sunyer (IDIBAPS) Hospital Clínic Barcelona Barcelona Spain
2. Institute of Clinical Psychology and Psychotherapy Technische Universität Dresden Dresden Germany
3. Centre for Addiction and Mental Health Institute for Mental Health Policy Research Toronto Ontario Canada
4. Dalla Lana School of Public Health University of Toronto Toronto Ontario Canada
5. Faculty of Medicine Institute of Medical Science University of Toronto Toronto Ontario Canada
6. Campbell Family Mental Health Research InstituteCentre for Addiction and Mental Health Toronto Ontario Canada
7. Center for Interdisciplinary Addiction Research (ZIS) Department of Psychiatry and Psychotherapy University Medical Center Hamburg‐Eppendorf (UKE) Hamburg Germany
8. Department of Psychiatry Medical Faculty University of Leipzig Leipzig Germany