1. Department of Thoracic and Cardiovascular Surgery, Heart and Diabetes Center NRW, Ruhr-University Bochum, Bad Oeynhausen, Germany
2. Department of Cardiology, University of Giessen, Giessen, Germany
3. Department of Internal Medicine, St.-Johannes-Hospital, Dortmund, Germany
4. German Society of Thoracic, Cardiac and Vascular Surgery, Berlin, Germany
5. Department of Cardiology, University of Heidelberg, Heidelberg, Germany
6. Clinic for Cardiovascular Surgery, German Heart Center Munich, Munich, Germany
7. BQS Institute for Quality and Patient Safety, Düsseldorf, Germany
8. Department of Cardiology, Kerckhoff Heart and Thorax Center, Bad Nauheim, Germany
9. Department of Cardiac Surgery, Heart Center Leipzig, University of Leipzig, Leipzig, Germany
10. Department of Thoracic and Cardiovascular Surgery, Klinikum Braunschweig, Braunschweig, Germany
11. Department of Cardiac Surgery, Kerckhoff Heart and Thorax Center, Bad Nauheim, Germany
12. Department of Cardiology, Asklepios Klinik St. Georg, Hamburg, Germany