1. Medical Clinic I, Ludwig-Maximilians-University , Munich , Germany
2. Department of Medical Biometry and Epidemiology, University Medical Center Hamburg-Eppendorf , Hamburg , Germany
3. Department of Neurology, Universitätsklinikum Würzburg , Würzburg , Germany
4. Institute for Experimental Cardiovascular Medicine, University Heart Center, University of Freiburg, Freiburg, Germany; and Institute of Physiology, Medical Faculty Carl Gustav Carus , TU Dresden, Dresden
5. Department of Medicine I, Brandenburg Municipal Hospital , Brandenburg , Germany
6. Department of Cardiology, Hospital Detmold , Detmold , Germany
7. Department of Cardiology/Angiology, University Hospital Eppendorf , Hamburg , Germany
8. Department of Cardiovascular Medicine, University Hospital Münster , Münster , Germany