1. Department of Internal Medicine, St.-Johannes-Hospital, Johannesstraße 9-13, 44137 Dortmund, Germany
2. Department of Cardiology, Kerckhoff Heart and Thorax Center, Benekestraße 2-8, 61231 Bad Nauheim, Germany
3. Medical Clinic I, Department of Cardiology and Angiology, University of Giessen, Klinikstraße 33, 35392 Giessen, Germany
4. Department of Cardiology, Klinikum Oldenburg, Rahel-Straus-Straße 10, 26133 Oldenburg, Germany