1. Cincinnati Children’s Hospital Heart Institute, Department of Pediatrics, University of Cincinnati College of Medicine, OH (A.M.L., A.L., D.L.S.M., L.S.).
2. Johns Hopkins University, Baltimore, MD (A.C.).
3. Stanford University School of Medicine (Pediatrics) and Stanford Children’s Health, Palo Alto, CA (C.S.A., D.N.R.).
4. Cleveland Clinic Children’s, OH (S.A.).
5. Stollery Children’s Hospital, Edmonton, Alberta, Canada (J.C.).
6. Seattle Children’s Hospital, WA (J.M.F.-L.).
7. Nationwide Children’s Hospital, Columbus, OH (R.J.G.).
8. Children’s Hospital of Wisconsin and Herma Heart Institute, Medical College of Wisconsin, Milwaukee (S.J.K.).
9. Children’s Hospital of Philadelphia, PA (M.J.O.).
10. Congenital Heart Center, C.S. Mott Children’s Hospital, University of Michigan, Ann Arbor (D.M.P., K.R.S.).
11. Children’s Mercy Hospital, Kansas City, MO (D.L.S.).