1. Pediatric Cardiology, Cleveland Clinic Children’s & Electrophysiology, Cleveland Clinic, OH (E.V.S.).
2. University of Iowa Stead Family Children’s Hospital (I.L.).
3. Children’s National Medical Center, Washington, DC (C.I.B.).
4. Departments of Cardiovascular Medicine, Pediatric & Adolescent Medicine, and Molecular Pharmacology & Experimental Therapeutics, Mayo Clinic, Rochester, MN (M.J.A.)
5. Nicklaus Children’s Hospital, Miami, FL (R.J.K.).
6. Division of Cardiology, Department of Pediatrics, University of British Columbia, Vancouver, Canada (S.S.).
7. Inova Children’s Hospital, Falls Church, VA (M.I.C.).
8. Ann and Robert H. Lurie Children’s Hospital, Chicago, IL (S.B.).
9. Emory University, Atlanta, GA (P.S.F.).
10. Children’s Hospital Minnesota, Minneapolis (D.A.B.).
11. Yale University School of Medicine, New Haven, CT (J.D., C.B., L.S., F.L., R.J.L.).
12. University of Iowa (B.O.).
13. Good Samaritan Hospital, Cedars-Sinai Heart Institute, Los Angeles, CA (D.S.C.).