1. Department of Cardiology, Heart Centre Brandenburg Bernau & Faculty of Health Sciences Brandenburg, Brandenburg Medical School Theodor Fontane, Bernau, Germany
2. Heart Center Hannover, Clinic for Cardiology & Electrophysiology, Hannover, Germany
3. Asklepios Clinic Barmbek, Hamburg, Germany
4. Department of Cardiology, St. Marien Hospital, Hamm, Germany
5. University Medical Center Hamburg-Eppendorf, Institute of Medical Biometry and Epidemiology, Hamburg, Germany
6. BIOTRONIK, Berlin, Germany
7. KMG Clinic, Department of Rhythmology and Clinical Electrophysiology, Güstrow, Germany