1. Durham Veterans Affairs Health Care System, Durham, North Carolina.
2. Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, North Carolina.
3. Center for the Study of Aging and Human Development, Duke University Medical Center, Durham, North Carolina.
4. Department of Psychology, University of Central Florida, Orlando, Florida.
5. Geriatric Research, Education and Clinical Center, Durham Veterans Affairs Health Care System, Durham, North Carolina.