1. Department of Cardiac and Thoracic Vascular Surgery, Universitätsklinikum Schleswig-Holstein, Lübeck, Schleswig-Holstein, Germany
2. Department of Cardiology, Angiology and Intensive Care Medicine, Universitätsklinikum Schleswig-Holstein, Lübeck, Schleswig-Holstein, Germany
3. Department of Cardiac and Thoracic Surgery, Universitätsklinikum Halle, Halle, Sachsen-Anhalt, Germany