1. Carolina Population Center, The University of North Carolina at Chapel Hill Chapel Hill North Carolina USA
2. Department of Epidemiology and Prevention National Center for Global Health and Medicine Tokyo Japan
3. Department of Epidemiology Gillings School of Global Public Health, The University of North Carolina at Chapel Hill Chapel Hill North Carolina USA
4. Department of Biostatistics Gillings School of Global Public Health, The University of North Carolina at Chapel Hill Chapel Hill North Carolina USA
5. Department of Sociology The University of North Carolina at Chapel Hill Chapel Hill North Carolina USA
6. Department of Genetics, School of Medicine The University of North Carolina at Chapel Hill Chapel Hill North Carolina USA
7. Department of Nutrition Gillings School of Global Public Health, The University of North Carolina at Chapel Hill Chapel Hill North Carolina USA