1. Department of Surgery Rocky Mountain Regional Veterans Affairs Medical Center, VA Eastern Colorado Health Care System Aurora Colorado United States
2. Department of Surgery University of Colorado School of Medicine Aurora Colorado United States
3. Rocky Mountain Regional Veterans Affairs Medical Center, Geriatric Research Education and Clinical Center (GRECC) VA Eastern Colorado Health Care System Aurora Colorado United States
4. Geriatrics Section, Department of Medicine Rocky Mountain Regional Veterans Affairs Medical Center, VA Eastern Colorado Health Care System Aurora Colorado United States