1. Department of Pediatrics, University of New Mexico Health Sciences Center, Albuquerque, New Mexico
2. Division of Neonatology, Department of Pediatrics, University of Utah School of Medicine, Salt Lake City, Utah
3. Department of Pediatrics, Rainbow Babies & Children's Hospital, Case Western Reserve University, Cleveland, Ohio
4. Statistics and Epidemiology Unit, RTI International, Rockville, Maryland
5. Statistics and Epidemiology Unit, RTI International, Research Triangle Park, North Carolina
6. Department of Pediatrics, Children's Healthcare of Atlanta, Emory University School of Medicine, Atlanta, Georgia
7. Department of Pediatrics, Indiana University School of Medicine, Indianapolis, Indiana
8. Department of Pediatrics, Women & Infants Hospital, Brown University, Providence, Rhode Island
9. Department of Pediatrics, University of Texas Medical School at Houston, Houston, Texas
10. Department of Pediatrics, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, Ohio
11. Department of Pediatrics, University of Iowa, Iowa City, Iowa
12. Division of Neonatal and Developmental Medicine, Department of Pediatrics, Lucile Packard Children's Hospital, Stanford University School of Medicine, Palo Alto, California
13. Division of Newborn Medicine, Department of Pediatrics, Floating Hospital for Children, Tufts Medical Center, Boston, Massachusetts
14. Department of Pediatrics, Duke University, Durham, North Carolina
15. Department of Pediatrics, Wayne State University, Detroit, Michigan
16. Division of Neonatology, University of Alabama at Birmingham, Birmingham, Alabama
17. Department of Pediatrics, Yale University School of Medicine, New Haven, Connecticut
18. Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, Texas