1. Institute of Social Medicine, Occupational Health and Public Health (ISAP), Medical Faculty, Leipzig University, 04103 Leipzig, Germany
2. Department of Psychiatry and Psychotherapy, Medizinische Fakultät Carl Gustav Carus, TU Dresden, 01307 Dresden, Germany
3. Department of Psychiatry and Psychotherapy, Faculty of Medicine and University Hospital Cologne, University of Cologne, 50937 Köln, Germany