1. Comprehensive Heart Failure Center Würzburg, University of Würzburg, Würzburg, Germany
2. Department of Internal Medicine I, Division of Cardiology, University Hospital of Würzburg, Würzburg, Germany
3. Department of Medicine II, Division of Cardiology, University Hospital of Schleswig-Holstein, Lübeck, Germany
4. Department of Internal Medicine II, Division of Hematology, University Hospital of Würzburg, Würzburg, Germany