1. Imland Hospital Rendsburg, Department for Intensice Care Medicine, Rendsburg, Schleswig-Holstein, Germany
2. Department of Internal Medicine III, Heart Center, Martin-Luther-University Halle-Wittenberg, University Hospital, Germany
3. Department of Cardiology, Traunstein Hospital, Traunstein, Germany
4. University of Leipzig-Heart Center, Department of Internal Medicine/Cardiology, Leipzig, Germany
5. Department of Acute and Emergency Care, St.-Antonius-Hospital gGmbH, Eschweiler, Germany
6. Department of Cardiac Surgery, University Hospital, Moorenstrasse 5, Duesseldorf, Germany
7. Department of Thoracic and Cardiovascular Surgery, West German Heart and Vascular Center Essen, University Hospital Essen, Essen, Germany