1. Department of Pediatrics, University of Florida College of Medicine-Jacksonville, Jacksonville, Florida;
2. National Institute of Child Health and Human Development, Bethesda, Maryland;
3. Division of Child Development, University of Mississippi Medical Center, Jackson, Mississippi;
4. Division of Endocrinology and Diabetes, University of Texas Health Sciences Center, San Antonio, Texas;
5. Division of Environmental Health Services, University of Minnesota School of Public Health, Minneapolis, Minnesota;
6. Department of Pediatrics, University of Massachusetts, Worcester, Massachusetts;
7. Carolina Population Center, University of North Carolina, Chapel Hill, North Carolina; and
8. Department of Pediatrics, School of Medicine, University of Colorado Denver, Denver, Colorado