1. Division of Cardiology, Department of Medicine, Medical University of Graz, Graz, Austria
2. 3rd Medical Department for Cardiology and Intensive Care, Klinik Ottakring, Vienna, Austria
3. Department of Medicine, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden
4. Department of Cardiology, Clinic Saint-Jean, Brussels, Belgium
5. University Hospital Center Sestre Milosrdnice, Zagreb, Croatia
6. Royal Brompton Hospital, London, UK
7. University of Southern California, Los Angeles, CA, USA
8. Clinical Centre of Serbia, Pacemaker Centre, Belgrade, Serbia
9. Department of Cardiology, Congenital Heart Defects and Electrotherapy, Medical University of Silesia, Silesian Centre for Heart Disease, Zabrze, Poland
10. Department of Cardiology, Arrhythmia Clinic, ASZ Aalst, Aalst, Belgium
11. Helios Clinic Koethen, Koethen, Germany
12. Faculty of Medicine, University of Belgrade, Belgrade, Serbia
13. Department for Intensive Care in Cardiac Arrhythmias, Cardiology Clinic, Clinical Centre of Serbia, Belgrade, Serbia
14. Hannover Heart Rhythm Center, Department of Cardiology and Angiology, Hannover Medical School, Carl-Neuberg-Str. 1, D-30625 Hannover, Germany