1. Department of Psychosomatic Medicine and Psychotherapy, Segeberg Hospitals, Am Kurpark 1, D - 23795 Bad Segeberg, Germany
2. Department of Health Psychology, Medical School Hamburg, Am Kaiserquai 1, D - 20547 Hamburg, Germany
3. Neurozentrum Thalwil, Gotthardstrasse 52, CH – 8800 Thalwil, Switzerland