1. Cardio Centrum Berlin, Academic Teaching Institution of Charité, Medical University Berlin, Berlin, Germany
2. Department of Cardiac Surgery, German Heart Center Berlin, Berlin, Germany
3. Department of Cardiac, Thoracic, Transplantation and Vascular Surgery, Hannover Medical School, Hannover, Germany
4. Department of Cardiology, Unfallkrankenhaus Berlin, Academic Teaching Hospital of Charité, Medical University Berlin, Berlin, Germany
5. Department of Cardiovascular Surgery, Charité Hospital, Medical University Berlin, Berlin, Germany