1. Rhythmology Department Helios Clinic Koethen Koethen Germany
2. Department of Internal Medicine II General Hospital Wiener Neustadt Wiener Neustadt Austria
3. Royal Brompton Hospital London UK
4. Rhythmology and Electrophysiology, Department of Cardiology and Angiology Hannover Medical School Hannover Germany
5. Department of Cardiology Univeristy Hospital Center Sestre Milosrdnice Zagreb Croatia
6. Department of Electrophysiology Heart Center Leipzig Leipzig Germany
7. Department of Cardiology Medical University of Lodz Lodz Poland
8. Rhythmology Department CHU de Poitiers Poitiers France
9. Department of Translational Medical Sciences University of Campania "Luigi Vanvitelli"—Monaldi Hospital Naples Italy
10. Amosov National Institute of Cardiovascular Surgery Kyiv Ukraine
11. Heart and Vascular Center Semmelweis University Budapest Hungary
12. Cardiovascular Center, OLV Hospital Aalst Belgium