1. Friedman School of Nutrition Science and Policy, Tufts University, Boston, MA
2. Nutritional Epidemiology Program, Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA
3. MassGeneral Hospital for Children, Boston, MA
4. Harvard Medical School, Boston, MA
5. Department of Public Health and Community Medicine, School of Medicine, Tufts University, Boston, MA
6. Divisions of Adolescent Medicine, Alpert Medical School of Brown University, Providence, RI
7. Divisions of Endocrinology, Hasbro Children's Hospital, Alpert Medical School of Brown University, Providence, RI