1. Hartford Hospital Hartford Connecticut
2. University of Michigan Ann Arbor Michigan
3. University Hospital Rangueil Toulouse France
4. Institute for Clinical and Experimental Medicine Prague Czech Republic
5. Jiangsu Province HospitalThe First Affiliated Hospital of Nanjing Medical University Nanjing China
6. Sree Chitra Institute for Medical Sciences and Technology Thiruvananthapuram India
7. Centro Privado de Cardiología Tucuman Argentina
8. Instituto Brasília de Arritmia Brasília Brazil
9. Duke University Medical Center Durham North Carolina
10. Beth Israel Deaconess Medical Center Boston Massachusetts
11. Heart InstituteTeknon Medical Center Barcelona Spain
12. University of Pennsylvania Philadelphia Pennsylvania
13. Cleveland Clinic Cleveland Ohio
14. Washington University School of Medicine St. Louis Missouri
15. Hospital Cardiologico SOS Cardio Florianopolis Brazil
16. Northwestern University Feinberg School of Medicine Chicago Illinois
17. Ospedale San Raffaele Milan Italy
18. Herz‐ und Gefäß‐Klinik Bad Neustadt Germany
19. University of Maryland Baltimore Maryland
20. Hospital General de Agudos Cosme Argerich Buenos Aires Argentina
21. University of QueenslandThe Prince Charles Hospital Chermside Australia
22. University of Alabama at Birmingham Birmingham Alabama
23. Indiana University School of MedicineKrannert Institute of Cardiology Indianapolis Indiana
24. University of Tsukuba Ibaraki Japan
25. University of California San Francisco Benioff Children's Hospital San Francisco California
26. Canberra HospitalAustralian National University Canberra Australia
27. CardioInfantil FoundationCardiac Institute Bogota Columbia
28. Queen Elizabeth II Health Sciences Centre Halifax Canada
29. University Hospital AntwerpUniversity of Antwerp Antwerp Belgium
30. Kyorin University School of Medicine Tokyo Japan
31. Vanderbilt University Heart and Vascular Center Nashville Tennessee
32. Brigham and Women's Hospital Boston Massachusetts
33. University of Colorado Denver Aurora Colorado
34. Leiden University Medical Center Leiden The Netherlands