1. The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania;
2. Boston Children’s Hospital, Boston, Massachusetts;
3. Texas Children’s Hospital, Houston, Texas;
4. Stollery Children’s Hospital and the Western Canadian Complex Pediatric Therapies Follow-up Program, Edmonton, Alberta, Canada;
5. Division of Pediatric Cardiology, Medical University of South Carolina, Charleston, South Carolina;
6. Starship Children’s Hospital, Auckland, New Zealand;
7. Children’s National Medical Center, Washington, District of Columbia;
8. Children’s Hospital and Medical Center, Omaha, Nebraska;
9. Medical College of Wisconsin, Children’s Hospital of Wisconsin, Milwaukee, Wisconsin;
10. Mott’s Children’s Hospital, Ann Arbor, Michigan;
11. University Hospital Aachen, Aachen, Germany;
12. Toyama University Hospital, Toyama, Japan;
13. Johns Hopkins All Children’s Heart Institute, St. Petersburg, Florida;
14. University of Queensland, Brisbane, Australia;
15. University Children’s Hospital Zurich, Zurich, Switzerland;
16. Duke University Medical Center, Durham, North Carolina;
17. Children’s Healthcare of Atlanta, Atlanta, Georgia;
18. University of California, San Francisco, San Francisco, California;
19. Primary Children’s Medical Center, Salt Lake City, Utah;
20. National Heart, Lung, and Blood Institute, Bethesda, Maryland;
21. Children’s Hospital Los Angeles, Los Angeles, California;
22. Alfred I. duPont Hospital for Children, Wilmington, Delaware;
23. The Royal Children’s Hospital, Melbourne, Australia;
24. University of British Columbia, Vancouver, British Columbia, Canada; and
25. New York-Presbyterian Morgan Stanley Children’s Hospital of New York, New York, New York