1. Department of Pediatrics, Division of Cardiology Children's Hospital Los Angeles, University of Southern California Keck School of Medicine Los Angeles California USA
2. Department of Pediatrics, Division of Cardiology Hospital for Sick Children, University of Toronto Toronto Ontario Canada
3. Department of Pediatrics, Division of Cardiology Benioff Children's Hospital, University of California San Francisco School of Medicine San Francisco California USA
4. Department of Pediatrics, Division of Cardiology Children's National Medical Center, George Washington University School of Medicine and Health Sciences Washington DC USA
5. Department of Pediatrics, Division of Cardiology Hospital for Sick Children, University of Toronto Faculty of Medicine Toronto Ontario Canada
6. Department of Pediatrics, Division of Cardiology Children's Hospital of Philadelphia, University of Pennsylvania Perelman School of Medicine Philadelphia Pennsylvania USA
7. Department of Pediatrics, Division of Cardiology Texas Children's Hospital, Baylor College of Medicine Houston Texas USA
8. Department of Pediatrics, Division of Cardiology Monroe Carell Jr. Children's Hospital, Vanderbilt University School of Medicine Nashville Tennessee USA
9. Department of Pediatrics, Division of Cardiology The Children's Heart Clinic and Children's Minnesota Minnesota USA
10. Department of Pediatrics, Division of Cardiology C.S. Mott Children's Hospital, University of Michigan Medical School Ann Arbor Michigan USA
11. Department of Pediatrics, Division of Cardiology Hassenfeld Children's Hospital at NYU Langone, New York University School of Medicine New York New York USA
12. Department of Pediatrics, Department of Cardiology Boston Children's Hospital, Harvard Medical School Boston Massachusetts USA