1. Cardiology, Bern University Hospital, 3010 Bern, Switzerland
2. Department of Cardiology, Maastricht University Medical Center, 6281 Maastricht, The Netherlands
3. Isar Medical Centre, 80331 Munich, Germany
4. Cardiovascular Center Frankfurt, 60389 Frankfurt, Germany
5. Cardiac Arrhythmia Research Center, Centro Cardiologico Monzino, IRCCS, 20138 Milan, Italy
6. Davidai Arrhythmia Center, Sheba Medical Center, 52621 Tel Hashomer, Israel