1. Department of Psychosomatic Medicine and Psychotherapy, Hannover Medical School, Hannover, Germany2Department of Psychosomatic Medicine and Psychotherapy, Medical University Hospital Erlangen, University of Erlangen-Nuremberg, Erlangen, Germany
2. Department of Psychosomatic Medicine and Psychotherapy, LWL-University, Ruhr-University Bochum, Bochum, Germany
3. Department of Psychosomatic Medicine and Psychotherapy, Medical University Hospital Tübingen, Tübingen, Germany
4. Department of Clinical Psychology and Psychotherapy, University of Tübingen, Tübingen, Germany6Department of Clinical Psychology and Psychotherapy, University of Freiburg, Freiburg, Germany
5. Department of Psychosomatic Medicine and Psychotherapy, Medical Faculty, University of Düsseldorf, Düsseldorf, Germany8Department of General Internal Medicine and Psychosomatics, Medical University Hospital Heidelberg, Heidelberg, Germany
6. Department of Medical Informatics, Biometry, and Epidemiology, University of Erlangen-Nuremberg, Erlangen, Germany
7. Netunion, Lausanne, Switzerland
8. Coordinating Centre for Clinical Trials, Philipps-University Marburg, Marburg, Germany
9. Department of Medical Psychology and Medical Sociology, University of Leipzig Medical Center, Leipzig, Germany