1. Department of Cardiology, Heart Center, Faculty of Medicine, University of Cologne, 50937 Cologne, Germany
2. Department of Internal Medicine II, Heart Center Bonn, University Hospital Bonn, 53127 Bonn, Germany
3. Department of Cardiology, Pulmonology and Vascular Medicine, University Hospital Düsseldorf, Medical Faculty of the Heinrich Heine University Düsseldorf, 40225 Düsseldorf, Germany
4. Department of Cardiology, Heart Center Leipzig at University of Leipzig, 04289 Leipzig, Germany
5. Department of Cardiology and Vascular Medicine, West German Heart and Vascular Center, University Hospital Essen, 45122 Essen, Germany
6. Department of Cardiology and Angiology, Justus-Liebig-University Giessen, 35392 Giessen, Germany
7. Department of Cardiology, University Medical Center of the Johannes Gutenberg-University Mainz, 55131 Mainz, Germany
8. Clinic for General and Interventional Cardiology/Angiology, Herz- und Diabeteszentrum NRW, Ruhr-Universität Bochum, 32545 Bad Oeynhausen, Germany
9. Medical Clinic I, Department of Cardiology, St. Johannes Hospital, 44137 Dortmund, Germany
10. Department of Cardiovascular Surgery, University Hospital Schleswig-Holstein, Campus Kiel, 24105 Kiel, Germany
11. Medizinische Klinik und Poliklinik I, Ludwig-Maximilians-Universität München, 81377 Munich, Germany