1. Department of Cardiovascular Surgery, Hospital Hietzing and Karl Landsteiner Institute for Cardiovascular Research, Vienna, Austria
2. Comprehensive Heart Center, University Hospital Halle (Saale), Halle (Saale), Germany
3. Department of Cardiac Surgery, University Heart Center Dresden, Dresden, Germany
4. Department of Cardiology, Hospital Hietzing, Vienna, Austria
5. Sigmund Freud University, Medical Faculty, Vienna, Austria