1. Department of Social Medicine, Harvard Medical School, Boston, Massachusetts.
2. Division of Adolescent and Young Adult Medicine, Children's Hospital, Boston, Massachusetts.
3. Department of Health and Social Behavior, Harvard School of Public Health, Boston, Massachusetts.
4. Department of Epidemiology, Harvard School of Public Health, Boston, Massachusetts.
5. Channing Laboratory, Department of Medicine, Harvard Medical School, and Brigham and Women's Hospital, Boston, Massachusetts.
6. Harvard Center for Cancer Prevention, Harvard School of Public Health, Boston, Massachusetts.
7. Division of Preventive Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts.
8. Department of Nutrition, Harvard School of Public Health, Boston, Massachusetts.
9. Department of Biostatistics, Harvard School of Public Health, Boston, Massachusetts.