1. University Clinic for Psychosomatic Medicine and Psychotherapy, Campus East-Westphalia, Medical Faculty, Ruhr-University Bochum, Virchowstr. 65, 32312 Luebbecke, Germany
2. Clinic for Thoracic and Cardiovascular Surgery, Herz- und Diabeteszentrum NRW, Ruhr-University Bochum, 32545 Bad Oeynhausen, Germany