1. Department of Health Behavior, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
2. Carolina Population Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27516, USA
3. Department of Nutrition, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
4. National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD 20892, USA
5. Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA