1. Department of Medicine, Denver Veterans Affairs Medical Center, University of Colorado Anschutz Medical Center, Denver, CO 80045, USA.
2. Department of Medicine and Office of Academic Affairs, National Jewish Health, Denver, CO 80206, USA.
3. Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado Anschutz Medical Campus, Denver, CO 80045, USA.
4. Department of Microbiology, Immunology, and Pathology, Mycobacteria Research Laboratories, Colorado State University, Fort Collins, CO 80523, USA.