1. LVR-Hospital Essen, Department of Psychiatry and Psychotherapy, Faculty of Medicine, University of Duisburg-Essen, Essen, Germany
2. St. Johannis-Hospital, Klinik für Psychiatrie, Klinikum Hochsauerland, Arnsberg, Germany, and Centre of Interdisciplinary Addiction Research (ZIS) of the University of Hamburg
3. Krankenhaus Maria Hilf, Warstein, Germany
4. AOK Nordwest, Dortmund, Germany
5. Department of Psychiatry, Psychotherapy, and Psychosomatic Medicine, Evangelisches Krankenhaus Castrop-Rauxel, Germany