1. Medical Care Line, Michael E. DeBakey VA Medical Center, Houston, TX, USA
2. Department of Medicine, Section of Pulmonary, Critical Care and Sleep Medicine, Baylor College of Medicine, Houston, TX, USA
3. DoD/VA Vision Center of Excellence, Bethesda, MD, USA
4. Allied Health Sciences, Baylor College of Medicine, Houston, TX, USA
5. Department of Medicine, Section of Infectious Diseases, Baylor College of Medicine, Houston, TX, USA