1. Märkische Kliniken GmbH; Department of Cardiology and Angiology; Klinikum Lüdenscheid; Lüdenscheid Germany
2. Department of Cardiology; University Witten/Herdecke; Witten Germany
3. Division of Electrophysiology; Department of Cardiovascular Medicine; University of Münster; Münster Germany
4. Medical Clinic I; Department of Cardiology; Justus-Liebig University of Giessen; Giessen Germany
5. Department of Cardiology; Helios Klinikum Wuppertal; Wuppertal Germany