| Affiliation: | From the Vanderbilt Epidemiology Center, Institute of Medicine and Public Health, Department of Obstetrics and Gynecology, and the Center for Human Genetics Research, Vanderbilt University, Nashville, Tennessee; the Epidemiology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina; the Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina; and the Departments of Epidemiology and Obstetrics and Gynecology, Brown University, Providence, Rhode Island. |
