1. Section of Surgical Sciences, Tennessee Valley Healthcare System, Veterans Affairs Medical Center, Nashville2Department of Surgery, Vanderbilt University, Nashville, Tennessee
2. Section of Surgical Sciences, Tennessee Valley Healthcare System, Veterans Affairs Medical Center, Nashville2Department of Surgery, Vanderbilt University, Nashville, Tennessee3Tennessee Valley Healthcare System, Veterans Affairs Medical Center, Geriatric
3. Section of Surgical Sciences, Tennessee Valley Healthcare System, Veterans Affairs Medical Center, Nashville4Department of Medicine, Vanderbilt University, Nashville, Tennessee