1. Department of Biostatistics Gillings School of Global Public Health University of North Carolina Chapel Hill North Carolina USA
2. Carolina Population Center University of North Carolina Chapel Hill North Carolina USA
3. Department of Biobehavioral Health College of Health and Human DevelopmentPennsylvania State University University Park Pennsylvania USA
4. Department of Epidemiology Gillings School of Global Public Health University of North Carolina Chapel Hill North Carolina USA
5. Department of Nutrition Gillings School of Global Public Health University of North Carolina Chapel Hill North Carolina USA
6. Department of Epidemiology and Biostatistics University of California San Francisco California USA