1. Center of Excellence for Health Services Research in Primary Care, Durham Veterans Affairs Medical Center, Durham, North Carolina.
2. Department of Health Policy and Management, University of North Carolina, Chapel Hill, North Carolina.
3. University of North Carolina Eshelman School of Pharmacy, Chapel Hill, North Carolina.
4. Ambulatory Care Services, Durham Veterans Affairs Medical Center, Durham, North Carolina.
5. Division of General Internal Medicine, Duke University, Durham, North Carolina.
6. Department of Biostatistics and Bioinformatics, Duke University Medical Center, Durham, North Carolina.
7. Geriatric Research, Education and Clinical Center, Durham Veterans Affairs Medical Center, Durham, North Carolina.
8. Department of Psychiatry, Duke University, Durham, North Carolina.
9. School of Nursing, Duke University, Durham, North Carolina.