1. Division of Cardiology, Department of Pediatrics, Washington University in St. Louis School of Medicine, MO (S.S., D.T.B.).
2. Yale University, New Haven, CT (J.D.A., W.H.).
3. Department of Congenital Heart Defects and Pediatric Cardiology, Heart Center, University of Freiburg, Germany (J.G.).
4. The Lillie Frank Abercrombie Section of Cardiology, Texas Children’s Hospital, Baylor College of Medicine, Houston (A.M.Q.).
5. The Children’s Hospital of Philadelphia, PA (J.J.R., M.J.G.).
6. Department of Paediatric Cardiology and Congenital Heart Defects, German Heart Centre, Munich (D.T.).
7. Division of Pediatric Cardiology, Morgan Stanley Children’s Hospital, Columbia University Medical Center, New York, NY (M.A.C.).
8. Department of Cardiology, Joe DiMaggio Children’s Hospital, Hollywood, FL (L.A.L.).
9. Division of Pediatric Cardiology, Seattle Children’s Hospital, University of Washington School of Medicine (B.H.M.).
10. Department of Pediatric Cardiology, University Hospitals Leuven, Belgium (M.G.).
11. Division of Pediatric Cardiology, University of New Mexico, Albuquerque (J.C.L.).
12. Children’s Hospital of Orange County, CA (F.B.).
13. Departments of Pediatrics and Cardiothoracic Surgery, Lucile Packard Children’s Hospital Heart Center, Stanford University School of Medicine, Palo Alto, CA (D.B.M.).