1. Department of Pediatrics, Emory University School of Medicine, Children’s Healthcare of Atlanta, Atlanta, Georgia
2. Social, Statistical, and Environmental Sciences Unit, RTI International, Research Triangle Park, North Carolina
3. Department of Pediatrics, University of Iowa, Iowa City
4. Department of Pediatrics, Rainbow Babies and Children’s Hospital, Case Western Reserve University, Cleveland, Ohio
5. Division of Neonatology, University of Alabama at Birmingham
6. Department of Pediatrics, Wayne State University, Detroit, Michigan
7. Department of Pediatrics, Women and Infants Hospital, Brown University, Providence, Rhode Island
8. Center for Perinatal Research, Department of Pediatrics, Nationwide Children’s Hospital, The Ohio State University, Columbus
9. Division of Neonatal and Developmental Medicine, Department of Pediatrics, Stanford University School of Medicine, Palo Alto, California10Lucile Packard Children's Hospital, Palo Alto, California
10. Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas
11. Social, Statistical, and Environmental Sciences Unit, RTI International, Rockville, Maryland
12. Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio
13. Department of Pediatrics, Indiana University School of Medicine, Indianapolis
14. Department of Pediatrics, University of Texas Medical School at Houston
15. Department of Pediatrics, Duke University, Durham, North Carolina
16. University of New Mexico Health Sciences Center, Albuquerque
17. University of Rochester School of Medicine and Dentistry, Rochester, New York
18. Department of Pediatrics, University of Pennsylvania, Philadelphia
19. Department of Pediatrics, Children's Mercy Hospital, Kansas City, Missouri
20. Department of Pediatrics, University of California, Los Angeles
21. Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland