1. Department of Internal Medicine I, Division of Cardiology, Angiology and Intensive Medical Care University Hospital Magdeburg, Otto von Guericke‐University Magdeburg Germany
2. Department of Internal Medicine I, Division of Cardiology, Angiology, Pneumology and Intensive Medical Care University Hospital Jena, Friedrich‐Schiller‐University Jena Germany
3. Institute of Physiotherapy University Hospital Jena, Friedrich‐Schiller‐University Jena Germany
4. Department of Internal Medicine, Division of Cardiology Virchow Klinikum, Charité Medical School Berlin Germany
5. Department of Medicine, Division of Cardiology Duke University Medical Center Durham NC USA
6. Duke Clinical Research Institute Durham NC USA