1. Department of Internal Medicine, Division of Cardiology, Heinrich-Braun-Klinikum, Zwickau, Germany
2. Department of Internal Medicine, Division of Cardiology, Jena University Hospital, Friedrich-Schiller-University of Jena, Jena, Germany
3. Department of Internal Medicine, Division of Nephrology, Heinrich-Braun-Klinikum, Zwickau, Germany