1. Department of Health Behavior, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
2. Department of Nutrition, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
3. Department of Family Medicine, School of Medicine, University of North Carolina, RTI International, Chapel Hill and Durham, North Carolina
4. Impaq International, Washington, DC
5. School of Nursing, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina