1. Department of Nutrition, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina.
2. Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina.
3. Carolina Population Center, University of North Carolina, Chapel Hill, North Carolina.
4. Department of Biostatistics, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina.
5. Institute for Global Health and Infectious Diseases, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina.