1. The University of Texas Health Science Center at San Antonio, Department of Medicine, Division of Pulmonary & Critical Care Medicine, San Antonio, TX, USA.
2. The University of Texas Health Science Center at San Antonio, Department of Medicine, Division of General Medicine, San Antonio, TX, USA and VERDICT (11C6) at the South Texas Veterans Health Care System, Audie L Murphy Division, San Antonio, TX, USA.
3. The University of Texas Health Science Center at San Antonio, Department of Medicine, Division of Pulmonary & Critical Care Medicine, San Antonio, TX, USA and South Texas Veterans Health Care System, Audie L Murphy Division, TX, USA.
4. The University of Texas Health Science Center at San Antonio, Department of Medicine, Division of Pulmonary & Critical Care Medicine, San Antonio, TX, USA and VERDICT (11C6) at the South Texas Veterans Health Care System, Audie L Murphy Division, San Antonio, TX, USA.