1. Division of Geriatrics, Gerontology & Palliative Medicine, The Sam & Ann Barshop Institute for Longevity & Aging Studies, UT Health San Antonio and San Antonio GRECC, South Texas VA Health Care System, San Antonio, Texas, USA
2. Baltimore VA Medical Center GRECC and VA Maryland Health Care System, Baltimore, Maryland, USA
3. Department of Physical Therapy and Rehabilitative Science, University of Maryland School of Medicine, Baltimore, Maryland, USA
4. Department of Family and Community Medicine, University of Maryland School of Medicine, Baltimore, Maryland, USA
5. Department of Medicine, Division of Gerontology and Geriatric Medicine, University of Maryland School of Medicine, Baltimore, Maryland, USA