1. Department of Nutrition; Gillings School of Global Public Health and School of Medicine, University of North Carolina at Chapel Hill; Chapel Hill North Carolina USA
2. Department of Epidemiology; Gillings School of Global Public Health and School of Medicine, University of North Carolina at Chapel Hill; Chapel Hill North Carolina USA
3. Department of Biostatistics; Gillings School of Global Public Health, University of North Carolina at Chapel Hill; Chapel Hill North Carolina USA