1. Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, Georgia
2. Epidemiology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, North Carolina
3. Aflac Cancer and Blood Disorders Center, Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia
4. Department of Gynecology and Obstetrics, Emory University School of Medicine, Atlanta, Georgia