1. Department of Veterans Affairs and Veterans Affairs Medical Center Baltimore, Geriatric Research, Education and Clinical Center (GRECC), Baltimore, MD, USA;
2. Department of Physical Therapy and Rehabilitation Science, University of Maryland School of Medicine, Baltimore, MD, USA;
3. Department of Surgery, Division of Vascular Surgery, University of Maryland and Baltimore VA Medical Center, Baltimore, MD, USA;
4. Department of Medicine, Division of Gerontology and Geriatric Medicine, University of Maryland School of Medicine, Baltimore, MD, USA