1. Division of Pulmonary and Critical Care, Department of Medicine
2. Applied Chest Imaging Laboratory, Department of Radiology
3. Lung Health Center, University of Alabama at Birmingham, Birmingham, Alabama
4. Asthma and COPD Program, Division of Pulmonary and Critical Care Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
5. Division of Pulmonary and Critical Care Medicine, University of Michigan Medical School, Ann Arbor, Michigan
6. Department of Anesthesia, and
7. Division of Cardiovascular, Brigham and Women’s Hospital, Boston, Massachusetts
8. Department of Epidemiology, Colorado School of Public Health, University of Colorado Anschutz Medical Campus, Aurora, Colorado; and
9. Hospital Clinic Barcelona, Barcelona, Spain