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