1. Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
2. Carolina Population Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
3. Biostatistics and Computational Biology Branch, National Institute of Environmental Health Sciences, Durham, North Carolina
4. Epidemiology Branch, National Institute of Environmental Health Sciences, Durham, North Carolina
5. Mammalian Genotyping Core, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
6. Department of Biostatistics, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
7. Department of Obstetrics and Gynecology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
8. Biostatistics and Biomathematics Program, Public Health Sciences Division, Fred Hutchinson Cancer Research Center, Seattle, Washington
9. Division for Mental and Physical Health, Norwegian Institute of Public Health, Oslo, Norway
10. Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway
11. Centre for Fertility and Health, Norwegian Institute of Public Health, Oslo, Norway