1. Division of Cardiology, Department of Medicine Medical University of Graz Austria
2. Helios Clinic Koethen Germany
3. Wilhelminenhospital, 3rd Medical Department for Cardiology and Intensive Care Vienna Austria
4. Division of Cardiology Hotel Dieu de France Hospital, Saint Joseph University Beirut Lebanon
5. University Medical Centre Ljubljana Department of Cardiology Ljubljana Slovenia
6. Clinical Centre of Serbia Pacemaker Centre Belgrade Serbia
7. Department of Cardiology Aalborg University Hospital Aalborg Denmark
8. Department of Cardiology Karolinska Institutet, Karolinska Hospital Stockholm Sweden
9. Department of Cardiology Arrhythmia Clinic Aalst Belgium
10. Hannover Heart Rhythm Center, Department of Cardiology and Angiology Hannover Medical School Hannover Germany