1. University of Virginia Children's Hospital Charlottesville VA USA
2. Columbia University Medical Center Morgan Stanley Children's Hospital of New York New York NY USA
3. Oslo University Hospital Rikshospitalet Oslo Norway
4. Arkansas Children's Hospital Little Rock AR USA
5. The Children's Hospital of Philadelphia Philadelphia PA USA
6. Le Bonheur Children's Hospital Memphis TN USA
7. University of Michigan Ann Arbor Michigan
8. King Faisal Specialist Hospital & Research Center Riyadh Saudi Arabia
9. Department of Congenital Heart Disease/Pediatric Cardiology Deutsches Herzzentrum Berlin Germany
10. Labatt Family Heart Centre Hospital for Sick Children University of Toronto Toronto ON Canada
11. Division of Pediatric Cardiology Children's Medical Center University of Texas Southwestern Medical Center Dallas TX USA
12. Department of Cardiovascular and Thoracic Surgery Children's Medical Center University of Texas Southwestern Medical Center Dallas TX USA