1. Department of Medicine, Duke University, Durham, North Carolina.
2. Department of Medicine, Center for the Study of Aging and Human Development, and Duke Health Community Care, Duke University, Durham, North Carolina.
3. Geriatric Research Education and Clinical Center, Durham Veterans Affairs Medical Center, Durham North Carolina.
4. Center for Palliative Care, Duke University Medical Center, Durham, North Carolina.
5. Department of Medicine, Center for the Study of Aging and Human Development, Duke University, Durham, North Carolina.
6. Center for Health Services Research in Primary Care, Durham Veterans Affairs Medical Center, Durham, North Carolina.