1. Institute of Occupational, Social and Environmental Medicine, Centre for Health and Society, Medical Faculty, Heinrich Heine University Düsseldorf, Dusseldorf, Germany
2. Department of Psychiatry and Psychotherapy, University Hospital rechts der Isar, School of Medicine, Technical University of Munich, Munchen, Germany
3. Institute for Health Services Research and Health Economics, Centre for Health and Society, Medical Faculty, Heinrich Heine University Düsseldorf, Dusseldorf, Germany