1. Alpert Medical School of Brown University, Providence, Rhode Island;
2. Women & Infants Hospital of Rhode Island, Providence, Rhode Island;
3. RTI International, Research Triangle Park, North Carolina;
4. Department of Pediatrics, Yale University School of Medicine, Yale New Haven Hospital, New Haven, Connecticut;
5. Department of Pediatrics, Wayne State University, Children’s Hospital of Michigan and Hutzel Women’s Hospital, Detroit, Michigan;
6. Department of Pediatrics, Stanford University School of Medicine, Lucile Packard Children’s Hospital, Palo Alto, California;
7. National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland; and
8. RTI International, Rockville, Maryland