[1
]Department of Pediatrics, University of Iowa, Iowa City
[2
]Department of Pediatrics, Stanford University, Palo Alto, California
[3
]Social, Statistical, and Environmental Sciences Unit, RTI International, Research
Triangle Park, North Carolina
[4
]Department of Pediatrics, University of Texas Southwestern, Dallas
[5
]Department of Pediatrics, University of Pennsylvania, Philadelphia
[6
]Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda,
Maryland
[7
]Department of Pediatrics, Brown University, Providence, Rhode Island
[8
]Department of Pediatrics, Emory University School of Medicine and Children’s Healthcare
of Atlanta, Atlanta, Georgia
[9
]Department of Pediatrics, University of Alabama, Birmingham
[10
]Department of Pediatrics, University of Texas at Houston, Houston
[11
]Department of Pediatrics, University of Cincinnati, Cincinnati, Ohio
[12
]Department of Pediatrics, The Ohio State University and Nationwide Children’s Hospital,
Columbus
[13
]Department of Pediatrics, Case Western Reserve University, Cleveland, Ohio
[14
]Department of Pediatrics, Duke University, Durham, North Carolina
[15
]Department of Pediatrics, University of Rochester, Rochester, New York
[16
]Department of Pediatrics, University of Utah, Salt Lake City
[17
]Department of Pediatrics, University of New Mexico, Albuquerque
[18
]Social, Statistical, and Environmental Sciences Unit, RTI International, Rockville,
Maryland
[19
]for the Eunice Kennedy Shriver National Institute of Child Health and Human Development
Neonatal Research Network