1. Department of Clinical Psychology and Psychotherapy, Institute of Psychology University of Goettingen Goettingen Germany
2. Department of Psychosomatic Medicine and Psychotherapy, Medical Faculty Heinrich Heine University Düsseldorf Germany
3. Department of Clinical Psychology and Psychotherapy Osnabrück University Osnabrück Germany
4. Klinik Lueneburger Heide Bad Bevensen Germany
5. Center for Psychosocial Medicine, Department of General Internal Medicine and Psychosomatics Heidelberg University Hospital Heidelberg Germany