1. Department of Cardiology, University Hospital Heidelberg, Im Neuenheimer Feld 410, Heidelberg, Germany
2. Department of Cardiology, Robert-Bosch-Hospital Stuttgart, Auerbachstrasse 110, Stuttgart, Germany
3. Department of Cardiac Surgery, University Hospital Heidelberg, Im Neuenheimer Feld 110, Heidelberg, Germany
4. Institute of Biostatistics and Mathematical Modelling, Goethe-University Frankfurt, Theodor-Stern-Kai 7, Frankfurt, Germany
5. German Center for Cardiovascular Research, DZHK, Partner Site Heidelberg, Theodor-Stern-Kai 7, Frankfurt, Germany
6. Department of Cardiovascular Surgery, German Heart Center Munich, Technische Universität, Lazarettstr. 36, Munich, Gemany
7. Department of Cardiology, University Hospital Gießen, Klinikstrasse 33, Gießen, Germany
8. Department of Cardiac Surgery, University of Lübeck, Ratzeburger Allee 160, Lübeck, Germany
9. Department of Cardiology, Asklepios Klinik St. Georg, Lohmühlenstrasse 5, Hamburg, Germany
10. Department of Cardiovascular Surgery, University of Freiburg, Hugstetter Strasse 55, Freiburg, Germany
11. Department of Cardiology, Kerckhoff Klinik Bad Nauheim, Benekestr. 2-8, Bad Nauheim, Germany
12. German Society for Thoracic and Cardiovascular Surgery, Langenbeck-Virchow-Haus, Luisenstr. 58-59, Berlin, Germany
13. Department of Cardiology, St.-Johannes Hospital Dortmund, Johannesstrasse 9-17, Dortmund, Germany
14. Department of Cardiothoracic Surgery, University Hospital Frankfurt, Theodor-Stern-Kai 7, Frankfurt, Germany