1. Department of Medicine,
2. Department of Pediatrics, and
3. Pulmonary Section, Rocky Mountain Regional Veterans Affairs Medical Center, Aurora, Colorado;
4. Roy and Diana Vagelos College of Physicians and Surgeons, Columbia University Medical Center, New York, New York; and
5. Department of Epidemiology, Colorado School of Public Health, Aurora, Colorado
6. Department of Immunology and Microbiology, University of Colorado School of Medicine, Aurora, Colorado;