1 Department of Epidemiology and Diagnostics, Institut für Therapieforschung (IFT), Centre for Mental Health and Addiction Research, Munich, Germany.
2 Department of Psychiatry and Psychotherapy, University Hospital, Ludwig-Maximilians-Universität Munich, Munich, Germany.
3 Department of Psychiatry and Psychotherapy, Center for Interdisciplinary Addiction Research, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
4 Department of Medical Psychology, Center for Health Care Research, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
5 Department of Psychiatry, Medical Faculty, University of Leipzig, Leipzig, Germany.
6 Zentrum für Psychosoziale Medizin, Klinikum Itzehoe, Itzehoe, Germany.
7 Department of Public Health Sciences, Centre for Social Research on Alcohol and Drugs, Stockholm University, Stockholm, Sweden.
8 Institute of Psychology, Eötvös Loránd University (ELTE), Budapest, Hungary.