1. Division of Maternal-Fetal Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts.
2. Harvard Medical School, Boston, Massachusetts.
3. Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, Massachusetts.
4. Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, Massachusetts.
5. Joslin Diabetes Center, Boston, Massachusetts.