1. Department of Pediatrics, Division of Pediatric Cardiology, Children’s Hospital of Wisconsin, Milwaukee (P.C.F., J.S.).
2. Department of Pediatrics, Division of Pediatric Cardiology, Medical College of Wisconsin, Milwaukee (P.C.F., J.S.).
3. Department of Pediatrics, Division of Pediatric Cardiology, New England Research Institutes, Waterford, MA (C.H., F.T.).
4. Department of Pediatrics, Division of Pediatric Cardiology, The Nemours Cardiac Center, Wilmington, DE (J.M.B.).
5. Department of Pediatrics, Division of Pediatric Cardiology, Duke University Hospital, Durham, NC (R.J.B.).
6. Department of Pediatrics, Division of Pediatric Cardiology, Medical University of South Carolina, Charleston (S.C.).
7. Department of Pediatrics, Division of Pediatric Cardiology, Cincinnati Children’s Hospital and Medical Center, OH (J.F.C.).
8. Department of Pediatrics, Division of Pediatric Cardiology, Hospital of Sick Children, Toronto, Canada (A.D.).
9. Department of Pediatrics, Division of Pediatric Cardiology, Boston Children’s Hospital, Harvard Medical School, MA (J.C.L., J.W.N.).
10. Department of Pediatrics, Division of Pediatric Cardiology, University of Michigan Medical School, Ann Arbor (J.L.).
11. Department of Pediatrics, Division of Pediatric Cardiology, Children’s Hospital of Philadelphia, University of Pennsylvania Medical School (L.M.-R.).
12. Department of Pediatrics, Division of Pediatric Cardiology, Primary Children’s Medical Center, University of Utah, Salt Lake City (T.A.M.).
13. Department of Pediatrics, Division of Pediatric Cardiology, Morgan Stanley Children’s Hospital of New York-Presbyterian (A.S.).
14. Department of Pediatrics, Division of Pediatric Cardiology, Columbia College of Physicians and Surgeons, New York, NY (A.S.).
15. Department of Pediatrics, Division of Pediatric Cardiology, Children’s Healthcare of Atlanta, Emory University, Atlanta, GA (T.C.S.).
16. Department of Pediatrics, Division of Pediatric Cardiology, John Hopkins All Children’s Health Institute, Baltimore, MD (G.S.).
17. Department of Pediatrics, Division of Pediatric Cardiology, Children’s Hospital Los Angeles, CA (P.W.).