1. Center for Addictive Disorders, Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatric Hospital, University of Zurich, Zürich, Switzerland
2. Department of Addictive Behaviour and Addiction Medicine, Central Institute of Mental Health (CIMH), University of Heidelberg/Medical Faculty Mannheim, Mannheim, Germany
3. Privatklinik Meiringen, Meiringen, Switzerland
4. Forel Klinik, Ellikon an der Thur, Switzerland