1. Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, and
2. Division of Pulmonary Sciences and Critical Care Medicine
3. Department of Microbiology and Immunology, Dartmouth College, Hanover, New Hampshire
4. Division of Biostatistics and Bioinformatics, National Jewish Health, Denver, Colorado
5. Department of Biostatistics and Informatics, Colorado School of Public Health, and
6. Department of Biomedical Engineering, University of Colorado, Anschutz Medical Campus, Aurora, Colorado; and