1. Cardiac Pacing Unit, University Hospital of Geneva , Geneva , Switzerland
2. First Department of Cardiology and Electrocardiology and Arterial Hypertension, Jagiellonian University , Krakow , Poland
3. Hospital Universitario y Politecnico La Fe, ValenciamSpain and Centro de Investigaciones Biomédicas en RED en Enfermedades Cardiovasculares (CIBERCV) , Madrid , Spain
4. Cardiocenter, Third Faculty of Medicine, Charles University and University Hospital, Kralovske Vinohrady , Prague , Czech Republic
5. Heart Centre, University Hospital Ghent , Ghent , Belgium
6. The First Affiliated Hospital of Wenzhou Medical University , Wenzhou , China
7. Bethel-Clinic , Bielefeld , Germany
8. Department of Medicine, McGill University Health Center , Montreal , Canada
9. Brigham and Women's Hospital , Boston, Massachusetts , United States of America
10. Department of Cardiology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University Medical Center , Maastricht , The Netherlands
11. Geisinger Wyoming Valley Medical Center , Wilkes-Barre, PA , United States of America
12. National Heart and Lung institute, Imperial College London , United Kingdom
13. Arrhythmia and Electrophysiology Unit, Santa Maria della Misericordia General Hospital , Rovigo , Italy