1. Division of Endocrinology, Children's Hospital Boston, Boston, Massachusetts,
2. Division of Endocrinology, Children's Hospital Boston, Boston, Massachusetts, Department of Pediatrics, Harvard Medical School, Boston, Massachusetts
3. Department of Pediatrics, Boston University School of Medicine, Boston, Massachusetts
4. Nutrition and Physical Activity Unit, Bureau of Family and Community Health, Massachusetts Department of Public Health, Boston, Massachusetts
5. Applied Statistics Evaluation and Technical Services, Bureau of Family and Community Health, Massachusetts Department of Public Health, Boston, Massachusetts