1. USDA/Agricultural Research Service, Western Human Nutrition Research Center, Davis, CA
2. Department of Nutrition, University of California, Davis, CA
3. Department of Nutrition, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC
4. the UNC Project, Lilongwe, Malawi
5. Division of Epidemiology and Biostatistics, School of Public Health, University of Witwatersrand, Johannesburg, South Africa
6. CDC, Atlanta, GA