1. Department of Psychosomatic Medicine and Psychotherapy, University Hospital of Erlangen, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Erlangen, Germany
2. Department of Psychosomatic Medicine and Psychotherapy, University Clinic of Bonn, Bonn, Germany
3. Department of Psychosomatic Medicine and Psychotherapy, Ulm University Medical Center, Ulm, Germany
4. Department of Psychosomatics and Psychotherapy, Medical Faculty and University Hospital, University of Cologne, Cologne, Germany
5. Department of Psychotherapy and Psychosomatic Medicine, Faculty of Medicine, Technische Universität Dresden, Dresden, Germany