[1] South Texas Veterans Health Care System,VERDICT research unit
[2] University of Texas Health Science Center at San Antonio,Department of Medicine, Division of General Internal Medicine
[3] University of Texas Health Science Center at San Antonio,Department of Psychiatry
[4] University of Texas Health Science Center at San Antonio,Department of Epidemiology and Biostatistics
[5] University of Texas Health Science Center at San Antonio,Deparment of Medicine, Division of Pulmonary and Critical Care Medicine