1. Department of Medicine,
2. Department of Medicine, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire;
3. Department of Environmental and Occupational Health Sciences, and
4. Department of Medicine, Johns Hopkins University, Baltimore, Maryland;
5. Department of Radiology, University of Iowa, Iowa City, Iowa;
6. Department of Radiology, University of Washington, Seattle, Washington;
7. Department of Medicine, Cardiovascular Research Institute, University of California, San Francisco, San Francisco, California;
8. Division of Respiratory, Critical Care, and Occupational Pulmonary Medicine, Department of Medicine, University of Utah Health Sciences Center, Salt Lake City, Utah;
9. Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, California;
10. Department of Medicine, College of Physicians and Surgeons, Columbia University Medical Center, New York, New York;
11. Marsico Lung Institute, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina;
12. Division of Pulmonary and Critical Care Medicine, Department of Medicine, Michigan Medicine, University of Michigan, Ann Arbor, Michigan;
13. Division of Pulmonary and Critical Care Medicine, Department of Medicine, Weill Cornell Medical College, Cornell University, New York, New York;
14. Section of Pulmonary, Critical Care, Allergy and Immunologic Diseases, Department of Internal Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina; and
15. Division of Respiratory Diseases, Department of Internal Medicine, Mayo Clinic, Scottsdale, Arizona