1. Department of Cardiology, Angiology and Pneumology, University Hospital Heidelberg, Ruprecht-Karls-University, Heidelberg, Germany
2. Department of Thoracic and Cardiovascular Surgery, University Hospital Frankfurt, Goethe University, Frankfurt/Main, Germany
3. Department of Cardiothoracic and Vascular Surgery, University Hospital Mainz, Johannes-Gutenberg University, Mainz, Germany