1. Heart Research Follow-up Program; University of Rochester School of Medicine & Dentistry; Rochester NY USA
2. The Summit Medical Group; Short Hills NJ USA
3. Cardiac Pacing & Electrophysiology; Department of Cardiovascular Medicine; Cleveland Clinic; Cleveland OH USA
4. Department of Electrocardiology; Medical University of Lodz; Lodz Poland
5. 1st Department of Cardiology; Medical University of Warsaw; Warsaw Poland
6. Heart Rhythm Service Queen's University; Kingston ON Canada
7. 1st Department of Cardiology; University of Athens Medical School; Hippokration Hospital; Athens Greece
8. Arrhythmias and Electrophysiology Service; Clinic and Maternity Suizo Argentina and De Los Arcos Private Hospital; Buenos Aires Argentina
9. SUNY Downstate Medical Center; Brooklyn NY USA
10. Department of Cardiology, Hypertension and Internal Medicine; 2nd Medical Faculty Medical University of Warsaw; Warsaw Poland
11. Department of Cardiology; Medical University of Lodz; Bieganski Hospital; Lodz Poland
12. Department of Cardiology; IRCCS Fondazione Salvatore Maugeri; Montescano Pavia Italy
13. California State University, Long Beach; Long Beach CA USA
14. Cardiovascular Department; Cardiology, Electrophysiology; Ospedale Niguarda; Milano Italy
15. Valley Hospital; Ridgewood NJ USA
16. Carver College of Medicine; University of Iowa; Iowa IA USA
17. Telecardiology Center; Institute of Cardiology; Warsaw Poland
18. University of Southern California; Los Angeles CA USA
19. Vascular Profiling Research Group; Cardiovascular Division; Harvard Medical School; Brigham & Women's Hospital; Boston MA USA
20. Knight Cardiovascular Institute; Oregon Health & Science University; Portland OR USA
21. Cardiovascular Division; Johns Hopkins University School of Medicine; Baltimore MD USA
22. Weill Cornell Medical College; Electrophysiology Services; New York Methodist Hospital; Brooklyn NY USA
23. Division of Cardiovascular Medicine; Beth Israel Deaconess Medical Center; Harvard Medical School; Harvard-Thorndike Electrophysiology Institute; Boston MA USA
24. Department of Cardiac Rehabilitation and Noninvasive Electrocardiology; National Institute of Cardiology; Warsaw Poland