1. Department of Cardiology II: Electrophysiology, University Hospital Münster , Albert-Schweitzer Campus 1, 48149 Münster , Germany
2. Department of Cardiac Electrophysiology, Heart Center Leipzig at University of Leipzig , Leipzig , Germany
3. Cardiology Department, La Paz University Hospital , Madrid , Spain
4. Department of Cardiology, University Hospital of Basel , Basel , Switzerland
5. Department of Cardiology, Leiden University Medical Centre , Leiden , The Netherlands
6. Section of Genetics, Department of Forensic Medicine, Faculty of Medical Sciences, University of Copenhagen , Copenhagen , Denmark
7. The Department of Cardiology, The Heart Centre, Copenhagen University Hospital, Rigshospitalet , Copenhagen , Denmark