1. Department of Epidemiology Gillings School of Global Public Health University of North Carolina at Chapel Hill Chapel Hill North Carolina USA
2. Departments of Nutrition and Biostatistics and Epidemiology School of Public Health and Health Sciences University of Massachusetts Amherst Amherst Massachusetts USA
3. Carolina Population Center University of North Carolina at Chapel Hill Chapel Hill North Carolina USA
4. Department of Microbiology and Immunology School of Medicine Virginia Commonwealth University Richmond Virginia USA
5. Public Health Sciences Division Fred Hutchinson Cancer Research Center Seattle Washington USA
6. Department of Bioinformatics University of North Carolina at Charlotte Charlotte North Carolina USA
7. Department of Obstetrics and Gynecology School of Medicine University of North Carolina at Chapel Hill Chapel Hill North Carolina USA