1. Department of Electrophysiology, Heart Center Leipzig at University Hospital, Strümpellstraße 39, 04289 Leipzig, Germany
2. Leipzig Heart Institute, Leipzig, Germany
3. Department for Arrhythmias and Cardiostimulation, National Institute for Cardiovascular Diseases, Bratislava, Slovakia
4. Department of Cardiology, Medical University of Warsaw, Warsaw, Poland
5. Department of Cardiology and Angiology, Hannover Medical School, Hannover Heart Rhythm Center, Hannover, Germany
6. Semmelweis University Heart and Vascular Center, Budapest, Hungary
7. Clinical Emergency Hospital of Bucharest, Clinical Electrophysiology and Pacing Laboratory, Bucharest, Romania
8. Department of Cardiology, Arrhythmia Clinic Aalst, Aalst, Belgium
9. Barts Heart Center, St Bartholomew's Hospital, London, UK
10. Royal Brompton & Harefield NHS Foundation Trust, Heart Division, London, UK
11. University of Liverpool and Liverpool Heart and Chest Hospital, Liverpool Centre for Cardiovascular Science, Liverpool, UK
12. Department of Cardiology Congenital Heart Disease and Electrotherapy, Silesian Medical University, Zabrze, Poland
13. School of Medicine, University of Belgrade, Belgrade, Serbia
14. Clinical Centre of Serbia, Cardiology Clinic, Belgrade, Serbia
15. Department of Cardiology, Helios Hospital Köthen, Köthen, Germany