1 Department of Psychiatry and Behavioral Sciences, Vanderbilt University Medical Center, Nashville, TN, and Veteran's Affairs Tennessee Valley Healthcare System, Geriatrics, Research, Education and Clinical Center (GRECC), Nashville, TN; Department of Psychiatry and Behavioral Sciences, Vanderbilt University Medical Center, Nashville, TN; Veteran's Affairs Tennessee Valley Healthcare System, Geriatrics, Research, Education and Clinical Center (GRECC), Nashville, TN, and Division of Pulmonary and Critical Care, Department of Medicine, and the Institute for Medicine and Public Health, the Center for Health Services Research, Vanderbilt University Medical Center, Nashville, TN.