1. LVR Hospital Bonn, Department of Addiction Disorders and Psychotherapy,
Bonn, Germany
2. LVR-Hospital Essen, Department of Psychiatry and Psychotherapy, Faculty
of Medicine, University of Duisburg-Essen, Essen, Germany
3. Witten/Herdecke University, Faculty of Health, Department of
Medicine, Witten, Germany
4. Department of Psychiatry, Psychotherapy and Psychosomatic Medicine,
Evangelisches Krankenhaus Castrop-Rauxel, Academic Teaching Hospital of the
University of Duisburg/Essen, Castrop-Rauxel, Germany