1. Division of Gerontology and Geriatric Medicine, Department of Medicine, University of Washington, Seattle, Washington 98104, United States
2. Geriatrics Research Education and Clinical Center, Veterans Affairs Puget Sound Health Care System, Seattle, Washington 98108, United States
3. Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, Washington 98195, United States
4. Department of Pathology, University of Washington, Seattle, Washington 98195, United States