1. Department of Medicine, Denver Health, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA.
2. Division of Infectious Diseases, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA.
3. Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA.
4. Pulmonary Section, Medicine Service, Rocky Mountain Regional Veterans Affairs Medical Center, Aurora, CO 80045, USA.
5. Department of Medicine and Office of Academic Affairs, National Jewish Health, Denver, CO 80206, USA.
6. Department of Pathology, Rocky Mountain Regional Veterans Affairs Medical Center, Aurora, CO 80045, USA.