1. Division of Reproductive Epidemiology and Infertility, Department of Obstetrics and Gynecology University of North Carolina at Chapel Hill Chapel Hill North Carolina
2. Department of Epidemiology, UNC Gillings School of Global Public Health University of North Carolina at Chapel Hill Chapel Hill North Carolina
3. Division of Cancer Prevention and Control Centers for Disease Control and Prevention Atlanta Georgia
4. Social and Scientific Systems Raleigh‐Durham North Carolina
5. Biostatistics and Computational Biology Branch National Institute of Environmental Health Services Research Triangle Park North Carolina
6. Epidemiology Branch National Institute of Environmental Health Services Research Triangle Park North Carolina