1. Children’s Mercy Hospitals and Clinics, Kansas City, MO (N.J.)
2. Saint Luke’s Mid America Heart Institute, Kansas City, MO (J.A.S., K.F.K.)
3. Sibley Heart Center–Emory Children’s Center, Egelston, GA (R.V.)
4. Children’s National Health System, Washington, DC (G.R.M.)
5. Cardiovascular Medicine, Yale School of Medicine, New Haven, CT (J.P.C.)
6. Arnold Palmer Hospital for Children and the University of Central Florida, Orlando (D.N.)
7. UCSF Benioff Children’s Hospital and the University of California, San Francisco (P.M.M.)
8. Boston Children’s Hospital, MA (L.B.).