1. Puget Sound Veterans Health Care System, Geriatric Research and Education Clinical Center (GRECC), Tacoma, WA 98498, USA
2. Division of Geriatrics and Gerontology, Department of Medicine, University of Washington, Seattle, WA 98109, USA
3. North Florida/South Georgia Veterans Health System, Geriatric Research and Education Clinical Center (GRECC), Gainesville, FL 32608, USA
4. College of Nursing, University of Florida, Gainesville, FL 32611, USA
5. Michael E. DeBakey Veterans Health Care System, Houston, TX 77030, USA
6. Palo Alto Veterans Health Care System, Palo Alto, CA 94304, USA
7. Institute on Aging, University of Texas Health Science Center at Houston, Houston, TX 77030, USA