1. Department of Cardiology, Boston Children’s Hospital, MA (B.P.Q., L.C.G., S.G.K., K.G., M.J.Y., L.B.).
2. Division of Cardio-Thoracic Sciences, Sindh Institute of Urology and Transplantation, Pakistan (B.H.).
3. Division of Pediatric Cardiology, UH Rainbow Babies and Children’s Hospital, Cleveland, OH (J.L.).
4. Division of Pediatric Cardiology, Columbia University Medical Center, New York Presbyterian/Morgan Stanley Children’s Hospital (O.M.B.).
5. Cincinnati Children’s Hospital–Heart Institute and Department of Pediatrics, University of Cincinnati College of Medicine, OH (S.S., S.P.B.).
6. The Heart Center, Nationwide Children’s Hospital, Columbus, OH (A.S.).
7. Division of Pediatric Cardiology, Children’s Wisconsin, Milwaukee (S.F.).
8. Heart Institute, UPMC Children’s Hospital of Pittsburgh and Department of Pediatrics, University of Pittsburgh School of Medicine, PA (B.G.).
9. Division of Pediatric Cardiology, UT Southwestern Medical Center, Children’s Medical Center Dallas, TX (A.D.).
10. Division of Pediatric Cardiology, Department of Pediatrics, University of California Davis, Sacramento (R.H.).
11. Division of Pediatric Cardiology, Monroe Carell Jr. Children’s Hospital at Vanderbilt University Medical Center, Nashville, TN (G.T.N.).
12. Division of Cardiology, Children’s Hospital of Philadelphia and Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania (M.L.O.).
13. Division of Pediatric Cardiology, University of Michigan Medical School, Ann Arbor (W.W.).