1. Geriatric Research, Education and Clinical Center, Audie L. Murphy Division, South Texas Veterans Health Care System, San Antonio, Texas
2. Department of Medicine, University of Texas Health Science Center at San Antonio, San Antonio, Texas
3. Department of Comprehensive Dentistry, University of Texas Health Science Center at San Antonio, San Antonio, Texas
4. Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, Texas
5. Departments of Urology and Biochemistry, University of California Davis, Sacramento, California
6. Research Service, Veterans Affairs Northern California Health Care System, Mather, California