1. Division of Cardiology, Department of Pediatrics University of Pittsburgh School of Medicine, UPMC Children's Hospital of Pittsburgh Pittsburgh Pennsylvania USA
2. The Heart Center Nationwide Children's Hospital Columbus Ohio USA
3. Division of Cardiology Children's Hospital of Philadelphia Philadelphia Pennsylvania USA
4. Division of Cardiology, Department of Pediatrics University of Texas Southwestern and the Heart Center at Children's Health Dallas Texas USA
5. Division of Pediatric Cardiology Washington University School of Medicine/Saint Louis Children's Hospital St. Louis Missouri USA
6. Division of Pediatric Cardiology University of Michigan Medical School Ann Arbor Michigan USA
7. Division of Cardiology Mayo Clinic Rochester Minnesota USA
8. Advocate Children's Hospital, Section of Pediatric Cardiology, Advocate Children's Hospital University of Illinois Hospital Chicago Illinois USA
9. Division of Cardiology, Carman and Ann Adams Department of Pediatrics Children's Hospital of Michigan Detroit Michigan USA
10. Department of Pediatrics, Division of Pediatric Cardiology University of Utah Salt Lake City Utah USA
11. Department of Pediatric Cardiology Rady Children's Hospital, UC San Diego San Diego California USA
12. Department of Biostatistics Medtronic Framingham Massachusetts USA
13. Department of Cardiology Seattle Children's Hospital Seattle Washington USA
14. The Heart Program Nicklaus Children's Hospital Miami Florida USA
15. Division of Pediatric Cardiology Columbia University Medical Center New York New York USA
16. Department of Pediatrics (Cardiology) Yale University School of Medicine New Haven Connecticut USA
17. Department of Cardiology Boston Children's Hospital Boston Massachusetts USA
18. Department of Cardiothoracic Surgery, Lucille Packard Children's Hospital Stanford University School of Medicine Palo Alto California USA