1. Department of Psychosomatic Medicine and Psychotherapy, University Hospital Tuebingen, University of Tuebingen, Osianderstr. 5, 72076 Tuebingen, Baden-Wuerttemberg, Germany
2. Institute of Occupational, Social and Environmental Medicine, Centre for Health and Society, Faculty of Medicine, Heinrich-Heine-University Duesseldorf, Moorenstraße 5, 40225 Duesseldorf, Nordrhein-Westfalen, Germany
3. Institute of Occupational and Social Medicine and Health Services Research, University Hospital Tübingen, University of Tuebingen, Wilhelmstraße 27, 72074 Tuebingen, Baden-Wuerttemberg, Germany
4. Department of Psychosomatic Medicine and Psychotherapy, University Hospital Ulm, Albert-Einstein-Allee 23, 89081 Ulm, Saxony-Anhalt, Germany
5. Department of Psychosomatic Medicine and Psychotherapy, Otto von Guericke University Magdeburg, University Hospital Magdeburg, Leipziger Straße 44, 39120 Magdeburg, Saxony-Anhalt, Germany