1. Epidemiology Branch, Division of Epidemiology, Statistics and Prevention Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, Maryland
2. Center for Perinatal Studies, Swedish Medical Center, Seattle, Washington
3. Department of Epidemiology, University of Washington School of Public Health, Seattle, Washington
4. Department of Nutrition, Harvard School of Public Health, Boston, Massachusetts
5. The Channing Laboratory, Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts
6. Department of Epidemiology, Harvard School of Public Health, Boston, Massachusetts