1. Heart Center Rostock, Department of Internal Medicine I, Divisions of Cardiology, University Hospital Rostock, Ernst-Heydemann-Str. 6, 18057 Rostock, Germany
2. Department of Internal Medicine III Cardiology and Angiology, University Hospital Schleswig-Holstein, Campus Kiel, Arnold-Heller-Straβe 3, 24105 Kiel, Germany
3. Arrhythmia Department, Skane University Hospital, SE-221 85 Lund, Sweden
4. Medical Clinic II Cardiology, Angiology and Intensive Care Medicine, University Hospital Schleswig-Holstein, Campus Lübeck, Ratzeburger Allee 160, 23538 Lübeck, Germany
5. Heart Center, Department of Cardiology, Rigshospitalet Copenhagen University Hospital, Copenhagen and Danish Arrhythmia Research Centre, University of Copenhagen, Blegdamsvej 9, 2100 København Ø, Denmark
6. Department Cardiology, University Hospital Würzburg, Oberdürrbacher Str. 6, 97080 Würzburg, Germany
7. Department of Internal Medicine I, Divisions of Cardiology, Internal and Intersive Care Medicine, Hospital Leverkusen, Am Gesundheitspark 11, 51375 Leverkusen, Germany
8. Heart and Diabetes Center North Rhine-Westphalia, University Clinic, Ruhr-University Bochum, Georgstr. 11, 32545 Bad Oeynhausen, Germany
9. Biotronik, Woermannkehre 1, 12359 Berlin, Germany
10. Department of Medical Biometry and Epidemiology, University Medical Center Hamburg Eppendorf, Martinistr. 52, 20246 Hamburg, Germany
11. Department of Electrophysiology, Heart Center Leipzig, University of Leipzig, Strümpellstr. 39, 04289 Leipzig, Germany