1. Department of Otolaryngology‐Head and Neck Surgery University of California, Los Angeles Los Angeles California U.S.A.
2. David Geffen School of Medicine University of California, Los Angeles Los Angeles California U.S.A.
3. Department of Biostatistics National Jewish Health Denver Colorado U.S.A.
4. Department of Radiology National Jewish Health Denver Colorado U.S.A.
5. Clinical Research Services National Jewish Health Denver Colorado U.S.A.
6. Division of Pulmonary Sciences and Critical Care Medicine, Department of Medicine University of Colorado School of Medicine Aurora Colorado U.S.A.
7. Department of Cell and Developmental Biology University of Colorado School of Medicine Aurora Colorado U.S.A.
8. Departments of Medicine and Pediatrics National Jewish Health Denver Colorado U.S.A.