1. Department of Internal Medicine I, Cardiology; University Hospital Würzburg; Oberdürrbacherstr 6 D-97080 Würzburg Germany
2. Comprehensive Heart Failure Center; University of Würzburg; Würzburg Germany
3. University of Würzburg; Institute of Clinical Epidemiology and Biometry; Würzburg Germany
4. Clinical Trial Center Würzburg; University Hospital Würzburg; Würzburg Germany
5. Department of Cardiology; Kerckhoff Klinik; Bad Nauheim Germany
6. Department of Internal Medicine I, Cardiology; University Hospital Hannover; Hannover Germany