1. Rigshospitalet, University of Copenhagen, Denmark (A.A., H.B.)
2. Brigham and Women’s Hospital, Boston, MA (A.A., H.F., C.Y.H.)
3. Boston Children’s Hospital, MA (A.M.V., J.-P.C., S.D.C.)
4. The present affiliation for J.-P. Couce is the London School of Hygiene and Tropical Medicine.
5. Cincinnati Children’s Hospital Medical Center, OH (J.L.J.)
6. Cleveland Clinic, OH (K.Z., H.L.)
7. Johns Hopkins University, Baltimore, MD (A.M.M.)
8. Stanford University School of Medicine, Palo Alto, CA (E.A.)
9. University of Michigan, Ann Arbor (S.M.D.)
10. New York University Langone Medical Center, NY (M.V.S.)
11. New England Research Institutes, Watertown, MA (L.S.)
12. University of Wisconsin, Madison (D.A.B.)
13. Washington University School of Medicine, St. Louis, MO (C.E.C.)