1. Columbia University Irving Medical Center New York New York USA
2. Kirklin Institute for Research in Surgical Outcomes Birmingham Alabama USA
3. Boston Children's Hospital Boston Massachusetts USA
4. Loma Linda University Children's Hospital Loma Linda California USA
5. Division of Cardiothoracic Surgery, Department of Surgery University of Alabama Birmingham Alabama USA
6. Mount Sinai Medical Center Kravis Children's Hospital New York New York USA
7. Children's Hospital of Minnesota Minneapolis Minnesota USA
8. Joe DiMaggio Children's Hospital Hollywood Florida USA
9. University of Alabama Pediatric Cardiology Birmingham Alabama USA