1. From the Departments of Cardiology (F.J.O., L.S., S.H., A.P.), Boston Children’s Hospital and Harvard Medical School, MA.
2. Department of Pediatrics, Harvard Medical School, Boston, MA (F.J.O., L.B.G., L.S., M.E.K., A.P.).
3. Department of Cardiology, Copenhagen University Hospital–Herlev and Gentofte, Hellerup, Denmark (F.J.O.).
4. Anesthesia (L.B.G., M.E.K.), Boston Children’s Hospital and Harvard Medical School, MA.
5. Department of Pediatrics, Hasbro Children’s Hospital, and Warren Alpert Medical School of Brown University, Providence, RI (L.B.G.).
6. Critical Care Medicine (M.E.K.), Boston Children’s Hospital and Harvard Medical School, MA.
7. Departments of Medicine, Cardiovascular Medicine (M.G.-H., S.M.H.), Brigham and Women’s Hospital, Boston, MA.
8. Radiology (S.M.), Brigham and Women’s Hospital, Boston, MA.
9. Department of Mathematics and Statistics, Boston University, MA (T.M., J.M.).
10. Harvard Clinical Research Institute, Boston, MA (T.M., J.M.).