1. Division of Pulmonary, Allergy, and Critical Care Medicine, and
2. UAB Lung Health Center, University of Alabama at Birmingham, Birmingham, Alabama
3. Birmingham VA Medical Center, Birmingham, Alabama
4. Division of Pulmonary and Critical Care Medicine, University of Michigan, Ann Arbor, Michigan
5. Division of Pulmonary and Critical Care Medicine, University of California, Los Angeles, Los Angeles, California
6. Division of Pulmonary and Critical Care Medicine, National Jewish Health, Denver, Colorado
7. University of Colorado at Denver, Aurora, Colorado
8. Division of Pulmonary and Critical Care Medicine, University of California, San Francisco, San Francisco, California
9. Marsico Lung Institute, Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
10. Department of Radiology, University of Iowa, Iowa City, Iowa
11. Departments of Medicine and Genetic Medicine, Weill Cornell Medicine, New York, New York
12. Department of Thoracic Medicine and Surgery, Lewis Katz School of Medicine, Temple University, Philadelphia, Pennsylvania
13. Wake Forest University, Winston-Salem, North Carolina
14. Division of Respiratory, Critical Care, and Occupational Pulmonary Medicine, University of Utah, Salt Lake City, Utah
15. Salt Lake City VA Medical Center, Salt Lake City, Utah
16. Division of Pulmonary and Critical Care Medicine, Johns Hopkins University, Baltimore, Maryland
17. Division of Pulmonary, Allergy, and Critical Care Medicine, Columbia University, New York, New York
18. IMED Biotech Unit, AstraZeneca, Cambridge, United Kingdom
19. Division of Pulmonary, Critical Care, Sleep, and Allergy, University of Nebraska Medical Center, Omaha, Nebraska; and
20. VA Ann Arbor Healthcare System, Ann Arbor, Michigan