1. Department of Experimental Cardiac Surgery and Heart Valve Replacement, University Hospital Schleswig-Holstein, Campus Kiel, Germany
2. Department of Cardiac and Vascular Surgery, University Medical Center Schleswig-Holstein, Campus Kiel, Kiel, Germany
3. Department of Cardiovascular Surgery, School of Medicine, Tampa General Hospital, University of South Florida, Florida, United States
4. Department of Cardiology and Angiology, University Medical Center Schleswig-Holstein, Campus Kiel, Kiel, Germany