1. Technische Universität München; Department of Psychosomatic Medicine and Psychotherapy, Klinikum Rechts der Isar; Munich Germany
2. University of Bonn; Department of Psychosomatic Medicine and Psychotherapy; Bonn Germany
3. Health and Accident Insurance Directorate; Federal Office of Public Health FOPH; Bern Switzerland
4. Institute for Quality and Efficiency in Health Care (IQWiG); Department Non-Drug Interventions; Im Mediapark 8 Köln Germany 50670