1. Division of Cardiology, Department of Pediatrics, Washington University in St. Louis School of Medicine, MO (S.S.).
2. The Heart Institute, Cincinnati Children’s Hospital Medical Center, OH (S.S., B.H.G.).
3. The Lillie Frank Abercrombie Section of Cardiology, Baylor College of Medicine, Texas Children’s Hospital, Houston (A.M.Q.).
4. Emory University School of Medicine, Children’s Healthcare of Atlanta, GA (C.J.P., H.D.B.-H., J.P.).
5. Division of Pediatric Cardiology, Columbia University Vagelos College of Physicians and Surgeons, New York Presbyterian Hospital (C.J.P.).
6. Department of Pediatrics, University of Pittsburgh School of Medicine, UPMC Children’s Hospital of Pittsburgh, PA (B.H.G.).
7. Perelman School of Medicine at the University of Pennsylvania, Children’s Hospital of Philadelphia (A.C.G.).
8. Department of Pediatrics, Emory University School of Medicine, Atlanta, GA (C.E.M., M.S.K.).
9. Department of Pediatrics, Division of Pediatric Cardiology, University of Alabama at Birmingham (M.A.L.).
10. Division of Pediatric Cardiology, Department of Pediatrics at the Ann and Monroe Carell Jr. Children’s Hospital at Vanderbilt, Nashville, TN (G.T.N.).
11. Department of Pediatrics, Division of Cardiology, University of Michigan, Ann Arbor (J.D.Z.).
12. Division of Pediatric Cardiology, University of California, San Francisco (J.M.).