1. Department of Medicine, Division of Pulmonary and Critical Care Medicine, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA
2. Department of Medicine, Division of Pulmonary and Critical Care Medicine, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA; VERDICT (11C6), South Texas Veterans Health Care System ALMD, 7400 Merton Minter Boulevard, San Antonio, TX 78229, USA