1. Department of Medicine, Division of Pulmonary and Critical Care Medicine,
2. Department of Biostatistics, School of Public Health,
3. Center for Environmental Medicine, Asthma, and Lung Biology, Division of Allergy and Immunology,
4. University of California, Los Angeles, Los Angeles, California;
5. Department of Medicine, Division of General Medicine and
6. Department of Epidemiology, Columbia University Medical Center, New York, New York;
7. University of Arizona, Tucson, Arizona;
8. Marsico Lung Institute/Cystic Fibrosis and Pulmonary Research Center, and
9. Department of Medicine, National Jewish Health, Denver, Colorado;
10. Department of Medicine, University of California, San Francisco, San Francisco, California;
11. Department of Radiology,
12. Department of Medicine, Division of Pulmonary and Critical Care Medicine, and
13. Department of Biomedical Engineering, University of Iowa, Iowa City, Iowa;
14. Temple University, Philadelphia, Pennsylvania;
15. Department of Biostatistics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina;
16. Wake Forest School of Medicine, Winston-Salem, North Carolina;
17. Weill Cornell, Division of Pulmonary and Critical Care Medicine, New York, New York;
18. Division of Pulmonary, Critical Care, Allergy and Sleep Medicine, Breathe Chicago Center, University of Illinois Chicago, Chicago, Illinois;
19. Division of Pulmonary, Allergy and Critical Care, University of Alabama at Birmingham, Alabama;
20. Division of Respiratory, Critical Care, Occupational Pulmonary Medicine, University of Utah, Salt Lake City, Utah;
21. Division of Pulmonary and Critical Care Medicine, Department of Medicine, Johns Hopkins University, Baltimore, Maryland; and
22. Department of Molecular, Cellular and Developmental Biology and
23. Medical Service, Veterans Affairs Ann Arbor Healthcare System, Ann Arbor, Michigan
24. Department of Microbiology and Immunology, University of Michigan, Ann Arbor, Michigan;