1. Center for Health Services Research in Primary Care, Durham Veterans Affairs Medical Center, Durham, North Carolina.
2. Division of General Internal Medicine, Department of Medicine, Duke University Medical Center, Durham, North Carolina.
3. Department of Biostatistics and Bioinformatics, Duke University Medical Center, Durham, North Carolina.
4. VA Connecticut Healthcare System, West Haven, Connecticut.
5. Department of Medicine, Yale University, New Haven, Connecticut.
6. Division of Endocrinology, Department of Medicine, Duke University Medical Center, Durham, North Carolina.
7. School of Nursing, Duke University School of Medicine, Durham, North Carolina.
8. Department of Psychiatry and Behavioral Sciences, Duke University School of Medicine, Durham, North Carolina.