1. Division of Endocrinology, Department of Medicine, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill2Cecil G. Sheps Center for Health Services Research, University of North Carolina at Chapel Hill, Chapel Hill
2. Division of Endocrinology, Department of Medicine, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill
3. Departments of Medicine and Biostatistics, University of North Carolina at Chapel Hill, Chapel Hill
4. Center for Health Promotion and Disease Prevention, UNC Chapel Hill, North Carolina
5. Cecil G. Sheps Center for Health Services Research, University of North Carolina at Chapel Hill, Chapel Hill
6. School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill
7. Cecil G. Sheps Center for Health Services Research, University of North Carolina at Chapel Hill, Chapel Hill6Department of Family Medicine, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill