1. Department of Cardiology, St. Johannes Hospital, 44137 Dortmund, Germany
2. Department of Cardiology, University of Oldenburg, 26129 Oldenburg, Germany
3. Department of Cardiovascular Surgery, University Hospital of Schleswig-Holstein, Campus Kiel, 24118 Kiel, Germany
4. Department of Cardiology, University of Bonn, 53113 Bonn, Germany
5. Department of Cardiac Surgery, St. Johannes Hospital, 44137 Dortmund, Germany
6. Department of Cardiology, University Hospital of Erlangen, 91054 Erlangen, Germany
7. Department of Cardiac Surgery, Kerckhoff Heart Center, 61231 Bad Nauheim, Germany
8. Department of Cardiology, Kerckhoff Heart Center, 61231 Bad Nauheim, Germany
9. Department of Cardiology, Justus-Liebig University of Giessen, 35390 Giessen, Germany