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the Department of Pediatrics, University of Iowa, Iowa City (E.F.B., K.J.J., J.A.W.); the Department of Pediatrics, Division of Neonatal and Developmental Medicine, Stanford University School of Medicine and Lucile Packard Children\u2019s Hospital, Palo Alto (S.R.H., V.Y.C.), and the Department of Pediatrics, University of California, Los Angeles, Los Angeles (U.D.) \u2014 both in California; the Biostatistics and Epidemiology Division, RTI International, Research Triangle Park (S.T., M.M.C.), and the Department of Pediatrics, Duke University School of Medicine, Durham (C.M.C.) \u2014 both in North Carolina; the Biostatistics and Epidemiology Division, RTI International, Rockville (J.E.N., A.D.), and the Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda (R.D.H.) \u2014 both in Maryland; the Department of Pediatrics, Wom..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Edward F.","family":"Bell","sequence":"additional","affiliation":[{"name":"From the Department of Pediatrics, University of Pennsylvania, and Children\u2019s Hospital of Philadelphia, Philadelphia (H.K., B.S., A.S.C.); the Department of Pediatrics, University of Iowa, Iowa City (E.F.B., K.J.J., J.A.W.); the Department of Pediatrics, Division of Neonatal and Developmental Medicine, Stanford University School of Medicine and Lucile Packard Children\u2019s Hospital, Palo Alto (S.R.H., V.Y.C.), and the Department of Pediatrics, University of California, Los Angeles, Los Angeles (U.D.) \u2014 both in California; the Biostatistics and Epidemiology Division, RTI International, Research Triangle Park (S.T., M.M.C.), and the Department of Pediatrics, Duke University School of Medicine, Durham (C.M.C.) \u2014 both in North Carolina; the Biostatistics and Epidemiology Division, RTI International, Rockville (J.E.N., A.D.), and the Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda (R.D.H.) \u2014 both in Maryland; the Department of Pediatrics, Wom..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Susan R.","family":"Hintz","sequence":"additional","affiliation":[{"name":"From the Department of Pediatrics, University of Pennsylvania, and Children\u2019s Hospital of Philadelphia, Philadelphia (H.K., B.S., A.S.C.); the Department of Pediatrics, University of Iowa, Iowa City (E.F.B., K.J.J., J.A.W.); the Department of Pediatrics, Division of Neonatal and Developmental Medicine, Stanford University School of Medicine and Lucile Packard Children\u2019s Hospital, Palo Alto (S.R.H., V.Y.C.), and the Department of Pediatrics, University of California, Los Angeles, Los Angeles (U.D.) \u2014 both in California; the Biostatistics and Epidemiology Division, RTI International, Research Triangle Park (S.T., M.M.C.), and the Department of Pediatrics, Duke University School of Medicine, Durham (C.M.C.) \u2014 both in North Carolina; the Biostatistics and Epidemiology Division, RTI International, Rockville (J.E.N., A.D.), and the Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda (R.D.H.) \u2014 both in Maryland; the Department of Pediatrics, Wom..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sylvia","family":"Tan","sequence":"additional","affiliation":[{"name":"From the Department of Pediatrics, University of Pennsylvania, and Children\u2019s Hospital of Philadelphia, Philadelphia (H.K., B.S., A.S.C.); the Department of Pediatrics, University of Iowa, Iowa City (E.F.B., K.J.J., J.A.W.); the Department of Pediatrics, Division of Neonatal and Developmental Medicine, Stanford University School of Medicine and Lucile Packard Children\u2019s Hospital, Palo Alto (S.R.H., V.Y.C.), and the Department of Pediatrics, University of California, Los Angeles, Los Angeles (U.D.) \u2014 both in California; the Biostatistics and Epidemiology Division, RTI International, Research Triangle Park (S.T., M.M.C.), and the Department of Pediatrics, Duke University School of Medicine, Durham (C.M.C.) \u2014 both in North Carolina; the Biostatistics and Epidemiology Division, RTI International, Rockville (J.E.N., A.D.), and the Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda (R.D.H.) \u2014 both in Maryland; the Department of Pediatrics, Wom..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Barbara","family":"Schmidt","sequence":"additional","affiliation":[{"name":"From the Department of Pediatrics, University of Pennsylvania, and Children\u2019s Hospital of Philadelphia, Philadelphia (H.K., B.S., A.S.C.); the Department of Pediatrics, University of Iowa, Iowa City (E.F.B., K.J.J., J.A.W.); the Department of Pediatrics, Division of Neonatal and Developmental Medicine, Stanford University School of Medicine and Lucile Packard Children\u2019s Hospital, Palo Alto (S.R.H., V.Y.C.), and the Department of Pediatrics, University of California, Los Angeles, Los Angeles (U.D.) \u2014 both in California; the Biostatistics and Epidemiology Division, RTI International, Research Triangle Park (S.T., M.M.C.), and the Department of Pediatrics, Duke University School of Medicine, Durham (C.M.C.) \u2014 both in North Carolina; the Biostatistics and Epidemiology Division, RTI International, Rockville (J.E.N., A.D.), and the Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda (R.D.H.) \u2014 both in Maryland; the Department of Pediatrics, Wom..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aasma S.","family":"Chaudhary","sequence":"additional","affiliation":[{"name":"From the Department of Pediatrics, University of Pennsylvania, and Children\u2019s Hospital of Philadelphia, Philadelphia (H.K., B.S., A.S.C.); the Department of Pediatrics, University of Iowa, Iowa City (E.F.B., K.J.J., J.A.W.); the Department of Pediatrics, Division of Neonatal and Developmental Medicine, Stanford University School of Medicine and Lucile Packard Children\u2019s Hospital, Palo Alto (S.R.H., V.Y.C.), and the Department of Pediatrics, University of California, Los Angeles, Los Angeles (U.D.) \u2014 both in California; the Biostatistics and Epidemiology Division, RTI International, Research Triangle Park (S.T., M.M.C.), and the Department of Pediatrics, Duke University School of Medicine, Durham (C.M.C.) \u2014 both in North Carolina; the Biostatistics and Epidemiology Division, RTI International, Rockville (J.E.N., A.D.), and the Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda (R.D.H.) \u2014 both in Maryland; the Department of Pediatrics, Wom..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karen J.","family":"Johnson","sequence":"additional","affiliation":[{"name":"From the Department of Pediatrics, University of Pennsylvania, and Children\u2019s Hospital of Philadelphia, Philadelphia (H.K., B.S., A.S.C.); the Department of Pediatrics, University of Iowa, Iowa City (E.F.B., K.J.J., J.A.W.); the Department of Pediatrics, Division of Neonatal and Developmental Medicine, Stanford University School of Medicine and Lucile Packard Children\u2019s Hospital, Palo Alto (S.R.H., V.Y.C.), and the Department of Pediatrics, University of California, Los Angeles, Los Angeles (U.D.) \u2014 both in California; the Biostatistics and Epidemiology Division, RTI International, Research Triangle Park (S.T., M.M.C.), and the Department of Pediatrics, Duke University School of Medicine, Durham (C.M.C.) \u2014 both in North Carolina; the Biostatistics and Epidemiology Division, RTI International, Rockville (J.E.N., A.D.), and the Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda (R.D.H.) \u2014 both in Maryland; the Department of Pediatrics, Wom..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Margaret M.","family":"Crawford","sequence":"additional","affiliation":[{"name":"From the Department of Pediatrics, University of Pennsylvania, and Children\u2019s Hospital of Philadelphia, Philadelphia (H.K., B.S., A.S.C.); the Department of Pediatrics, University of Iowa, Iowa City (E.F.B., K.J.J., J.A.W.); the Department of Pediatrics, Division of Neonatal and Developmental Medicine, Stanford University School of Medicine and Lucile Packard Children\u2019s Hospital, Palo Alto (S.R.H., V.Y.C.), and the Department of Pediatrics, University of California, Los Angeles, Los Angeles (U.D.) \u2014 both in California; the Biostatistics and Epidemiology Division, RTI International, Research Triangle Park (S.T., M.M.C.), and the Department of Pediatrics, Duke University School of Medicine, Durham (C.M.C.) \u2014 both in North Carolina; the Biostatistics and Epidemiology Division, RTI International, Rockville (J.E.N., A.D.), and the Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda (R.D.H.) \u2014 both in Maryland; the Department of Pediatrics, Wom..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jamie E.","family":"Newman","sequence":"additional","affiliation":[{"name":"From the Department of Pediatrics, University of Pennsylvania, and Children\u2019s Hospital of Philadelphia, Philadelphia (H.K., B.S., A.S.C.); the Department of Pediatrics, University of Iowa, Iowa City (E.F.B., K.J.J., J.A.W.); the Department of Pediatrics, Division of Neonatal and Developmental Medicine, Stanford University School of Medicine and Lucile Packard Children\u2019s Hospital, Palo Alto (S.R.H., V.Y.C.), and the Department of Pediatrics, University of California, Los Angeles, Los Angeles (U.D.) \u2014 both in California; the Biostatistics and Epidemiology Division, RTI International, Research Triangle Park (S.T., M.M.C.), and the Department of Pediatrics, Duke University School of Medicine, Durham (C.M.C.) \u2014 both in North Carolina; the Biostatistics and Epidemiology Division, RTI International, Rockville (J.E.N., A.D.), and the Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda (R.D.H.) \u2014 both in Maryland; the Department of Pediatrics, Wom..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Betty R.","family":"Vohr","sequence":"additional","affiliation":[{"name":"From the Department of Pediatrics, University of Pennsylvania, and Children\u2019s Hospital of Philadelphia, Philadelphia (H.K., B.S., A.S.C.); the Department of Pediatrics, University of Iowa, Iowa City (E.F.B., K.J.J., J.A.W.); the Department of Pediatrics, Division of Neonatal and Developmental Medicine, Stanford University School of Medicine and Lucile Packard Children\u2019s Hospital, Palo Alto (S.R.H., V.Y.C.), and the Department of Pediatrics, University of California, Los Angeles, Los Angeles (U.D.) \u2014 both in California; the Biostatistics and Epidemiology Division, RTI International, Research Triangle Park (S.T., M.M.C.), and the Department of Pediatrics, Duke University School of Medicine, Durham (C.M.C.) \u2014 both in North Carolina; the Biostatistics and Epidemiology Division, RTI International, Rockville (J.E.N., A.D.), and the Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda (R.D.H.) \u2014 both in Maryland; the Department of Pediatrics, Wom..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Waldemar A.","family":"Carlo","sequence":"additional","affiliation":[{"name":"From the Department of Pediatrics, University of Pennsylvania, and Children\u2019s Hospital of Philadelphia, Philadelphia (H.K., B.S., A.S.C.); the Department of Pediatrics, University of Iowa, Iowa City (E.F.B., K.J.J., J.A.W.); the Department of Pediatrics, Division of Neonatal and Developmental Medicine, Stanford University School of Medicine and Lucile Packard Children\u2019s Hospital, Palo Alto (S.R.H., V.Y.C.), and the Department of Pediatrics, University of California, Los Angeles, Los Angeles (U.D.) \u2014 both in California; the Biostatistics and Epidemiology Division, RTI International, Research Triangle Park (S.T., M.M.C.), and the Department of Pediatrics, Duke University School of Medicine, Durham (C.M.C.) \u2014 both in North Carolina; the Biostatistics and Epidemiology Division, RTI International, Rockville (J.E.N., A.D.), and the Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda (R.D.H.) \u2014 both in Maryland; the Department of Pediatrics, Wom..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carl T.","family":"D\u2019Angio","sequence":"additional","affiliation":[{"name":"From the Department of Pediatrics, University of Pennsylvania, and Children\u2019s Hospital of Philadelphia, Philadelphia (H.K., B.S., A.S.C.); the Department of Pediatrics, University of Iowa, Iowa City (E.F.B., K.J.J., J.A.W.); the Department of Pediatrics, Division of Neonatal and Developmental Medicine, Stanford University School of Medicine and Lucile Packard Children\u2019s Hospital, Palo Alto (S.R.H., V.Y.C.), and the Department of Pediatrics, University of California, Los Angeles, Los Angeles (U.D.) \u2014 both in California; the Biostatistics and Epidemiology Division, RTI International, Research Triangle Park (S.T., M.M.C.), and the Department of Pediatrics, Duke University School of Medicine, Durham (C.M.C.) \u2014 both in North Carolina; the Biostatistics and Epidemiology Division, RTI International, Rockville (J.E.N., A.D.), and the Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda (R.D.H.) \u2014 both in Maryland; the Department of Pediatrics, Wom..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kathleen A.","family":"Kennedy","sequence":"additional","affiliation":[{"name":"From the Department of Pediatrics, University of Pennsylvania, and Children\u2019s Hospital of Philadelphia, Philadelphia (H.K., B.S., A.S.C.); the Department of Pediatrics, University of Iowa, Iowa City (E.F.B., K.J.J., J.A.W.); the Department of Pediatrics, Division of Neonatal and Developmental Medicine, Stanford University School of Medicine and Lucile Packard Children\u2019s Hospital, Palo Alto (S.R.H., V.Y.C.), and the Department of Pediatrics, University of California, Los Angeles, Los Angeles (U.D.) \u2014 both in California; the Biostatistics and Epidemiology Division, RTI International, Research Triangle Park (S.T., M.M.C.), and the Department of Pediatrics, Duke University School of Medicine, Durham (C.M.C.) \u2014 both in North Carolina; the Biostatistics and Epidemiology Division, RTI International, Rockville (J.E.N., A.D.), and the Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda (R.D.H.) \u2014 both in Maryland; the Department of Pediatrics, Wom..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robin K.","family":"Ohls","sequence":"additional","affiliation":[{"name":"From the Department of Pediatrics, University of Pennsylvania, and Children\u2019s Hospital of Philadelphia, Philadelphia (H.K., B.S., A.S.C.); the Department of Pediatrics, University of Iowa, Iowa City (E.F.B., K.J.J., J.A.W.); the Department of Pediatrics, Division of Neonatal and Developmental Medicine, Stanford University School of Medicine and Lucile Packard Children\u2019s Hospital, Palo Alto (S.R.H., V.Y.C.), and the Department of Pediatrics, University of California, Los Angeles, Los Angeles (U.D.) \u2014 both in California; the Biostatistics and Epidemiology Division, RTI International, Research Triangle Park (S.T., M.M.C.), and the Department of Pediatrics, Duke University School of Medicine, Durham (C.M.C.) \u2014 both in North Carolina; the Biostatistics and Epidemiology Division, RTI International, Rockville (J.E.N., A.D.), and the Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda (R.D.H.) \u2014 both in Maryland; the Department of Pediatrics, Wom..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brenda B.","family":"Poindexter","sequence":"additional","affiliation":[{"name":"From the Department of Pediatrics, University of Pennsylvania, and Children\u2019s Hospital of Philadelphia, Philadelphia (H.K., B.S., A.S.C.); the Department of Pediatrics, University of Iowa, Iowa City (E.F.B., K.J.J., J.A.W.); the Department of Pediatrics, Division of Neonatal and Developmental Medicine, Stanford University School of Medicine and Lucile Packard Children\u2019s Hospital, Palo Alto (S.R.H., V.Y.C.), and the Department of Pediatrics, University of California, Los Angeles, Los Angeles (U.D.) \u2014 both in California; the Biostatistics and Epidemiology Division, RTI International, Research Triangle Park (S.T., M.M.C.), and the Department of Pediatrics, Duke University School of Medicine, Durham (C.M.C.) \u2014 both in North Carolina; the Biostatistics and Epidemiology Division, RTI International, Rockville (J.E.N., A.D.), and the Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda (R.D.H.) \u2014 both in Maryland; the Department of Pediatrics, Wom..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kurt","family":"Schibler","sequence":"additional","affiliation":[{"name":"From the Department of Pediatrics, University of Pennsylvania, and Children\u2019s Hospital of Philadelphia, Philadelphia (H.K., B.S., A.S.C.); the Department of Pediatrics, University of Iowa, Iowa City (E.F.B., K.J.J., J.A.W.); the Department of Pediatrics, Division of Neonatal and Developmental Medicine, Stanford University School of Medicine and Lucile Packard Children\u2019s Hospital, Palo Alto (S.R.H., V.Y.C.), and the Department of Pediatrics, University of California, Los Angeles, Los Angeles (U.D.) \u2014 both in California; the Biostatistics and Epidemiology Division, RTI International, Research Triangle Park (S.T., M.M.C.), and the Department of Pediatrics, Duke University School of Medicine, Durham (C.M.C.) \u2014 both in North Carolina; the Biostatistics and Epidemiology Division, RTI International, Rockville (J.E.N., A.D.), and the Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda (R.D.H.) \u2014 both in Maryland; the Department of Pediatrics, Wom..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robin K.","family":"Whyte","sequence":"additional","affiliation":[{"name":"From the Department of Pediatrics, University of Pennsylvania, and Children\u2019s Hospital of Philadelphia, Philadelphia (H.K., B.S., A.S.C.); the Department of Pediatrics, University of Iowa, Iowa City (E.F.B., K.J.J., J.A.W.); the Department of Pediatrics, Division of Neonatal and Developmental Medicine, Stanford University School of Medicine and Lucile Packard Children\u2019s Hospital, Palo Alto (S.R.H., V.Y.C.), and the Department of Pediatrics, University of California, Los Angeles, Los Angeles (U.D.) \u2014 both in California; the Biostatistics and Epidemiology Division, RTI International, Research Triangle Park (S.T., M.M.C.), and the Department of Pediatrics, Duke University School of Medicine, Durham (C.M.C.) \u2014 both in North Carolina; the Biostatistics and Epidemiology Division, RTI International, Rockville (J.E.N., A.D.), and the Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda (R.D.H.) \u2014 both in Maryland; the Department of Pediatrics, Wom..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John A.","family":"Widness","sequence":"additional","affiliation":[{"name":"From the Department of Pediatrics, University of Pennsylvania, and Children\u2019s Hospital of Philadelphia, Philadelphia (H.K., B.S., A.S.C.); the Department of Pediatrics, University of Iowa, Iowa City (E.F.B., K.J.J., J.A.W.); the Department of Pediatrics, Division of Neonatal and Developmental Medicine, Stanford University School of Medicine and Lucile Packard Children\u2019s Hospital, Palo Alto (S.R.H., V.Y.C.), and the Department of Pediatrics, University of California, Los Angeles, Los Angeles (U.D.) \u2014 both in California; the Biostatistics and Epidemiology Division, RTI International, Research Triangle Park (S.T., M.M.C.), and the Department of Pediatrics, Duke University School of Medicine, Durham (C.M.C.) \u2014 both in North Carolina; the Biostatistics and Epidemiology Division, RTI International, Rockville (J.E.N., A.D.), and the Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda (R.D.H.) \u2014 both in Maryland; the Department of Pediatrics, Wom..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John A.F.","family":"Zupancic","sequence":"additional","affiliation":[{"name":"From the Department of Pediatrics, University of Pennsylvania, and Children\u2019s Hospital of Philadelphia, Philadelphia (H.K., B.S., A.S.C.); the Department of Pediatrics, University of Iowa, Iowa City (E.F.B., K.J.J., J.A.W.); the Department of Pediatrics, Division of Neonatal and Developmental Medicine, Stanford University School of Medicine and Lucile Packard Children\u2019s Hospital, Palo Alto (S.R.H., V.Y.C.), and the Department of Pediatrics, University of California, Los Angeles, Los Angeles (U.D.) \u2014 both in California; the Biostatistics and Epidemiology Division, RTI International, Research Triangle Park (S.T., M.M.C.), and the Department of Pediatrics, Duke University School of Medicine, Durham (C.M.C.) \u2014 both in North Carolina; the Biostatistics and Epidemiology Division, RTI International, Rockville (J.E.N., A.D.), and the Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda (R.D.H.) \u2014 both in Maryland; the Department of Pediatrics, Wom..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Myra H.","family":"Wyckoff","sequence":"additional","affiliation":[{"name":"From the Department of Pediatrics, University of Pennsylvania, and Children\u2019s Hospital of Philadelphia, Philadelphia (H.K., B.S., A.S.C.); the Department of Pediatrics, University of Iowa, Iowa City (E.F.B., K.J.J., J.A.W.); the Department of Pediatrics, Division of Neonatal and Developmental Medicine, Stanford University School of Medicine and Lucile Packard Children\u2019s Hospital, Palo Alto (S.R.H., V.Y.C.), and the Department of Pediatrics, University of California, Los Angeles, Los Angeles (U.D.) \u2014 both in California; the Biostatistics and Epidemiology Division, RTI International, Research Triangle Park (S.T., M.M.C.), and the Department of Pediatrics, Duke University School of Medicine, Durham (C.M.C.) \u2014 both in North Carolina; the Biostatistics and Epidemiology Division, RTI International, Rockville (J.E.N., A.D.), and the Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda (R.D.H.) \u2014 both in Maryland; the Department of Pediatrics, Wom..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"William E.","family":"Truog","sequence":"additional","affiliation":[{"name":"From the Department of Pediatrics, University of Pennsylvania, and Children\u2019s Hospital of Philadelphia, Philadelphia (H.K., B.S., A.S.C.); 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