1. Division of General Medicine and Clinical Epidemiology, School of Medicine, University of North Carolina, Chapel Hill2Center for Health Promotion and Disease Prevention, University of North Carolina, Chapel Hill
2. Division of General Medicine and Clinical Epidemiology, School of Medicine, University of North Carolina, Chapel Hill2Center for Health Promotion and Disease Prevention, University of North Carolina, Chapel Hill3Cecil G. Sheps Center for Health Services R
3. Center for Health Promotion and Disease Prevention, University of North Carolina, Chapel Hill
4. Health Services and Systems Research Program, Duke–National University of Singapore Graduate Medical School, Singapore
5. Cecil G. Sheps Center for Health Services Research, University of North Carolina, Chapel Hill5Department of Family Medicine, School of Medicine, University of North Carolina, Chapel Hill
6. Center for Health Promotion and Disease Prevention, University of North Carolina, Chapel Hill6Department of Nutrition, Gillings School of Global Public Health, University of North Carolina, Chapel Hill
7. Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, Chapel Hill
8. Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis
9. Division of General Medicine and Clinical Epidemiology, School of Medicine, University of North Carolina, Chapel Hill3Cecil G. Sheps Center for Health Services Research, University of North Carolina, Chapel Hill
10. Cabarrus Family Medicine, Kannapolis, North Carolina
11. Department of Health Policy and Management, Gillings School of Global Public Health, University of North Carolina, Chapel Hill
12. Center for Health Promotion and Disease Prevention, University of North Carolina, Chapel Hill11Department of Biostatistics, Gillings School of Global Public Health, University of North Carolina, Chapel Hill
13. Center for Health Promotion and Disease Prevention, University of North Carolina, Chapel Hill5Department of Family Medicine, School of Medicine, University of North Carolina, Chapel Hill6Department of Nutrition, Gillings School of Global Public Health, Un