1. Division of Pulmonary and Critical Care Medicine and
2. Division of Pulmonary and Critical Care Medicine, Ohio State University, Columbus, Ohio;
3. Division of Pulmonary and Critical Care Medicine, University of North Carolina, Chapel Hill, North Carolina;
4. Division of Pulmonary and Critical Care Medicine, Medical University of South Carolina, Charleston, South Carolina;
5. Division of Pulmonary and Critical Care Medicine, Washington University in St. Louis, St. Louis, Missouri;
6. Division of Pulmonary and Critical Care Medicine, Northwestern University, Feinberg School of Medicine, Chicago, Illinois;
7. Department of Radiology, Johns Hopkins University, Baltimore, Maryland;
8. Division of Pulmonary and Critical Care Medicine, Morehouse School of Medicine, Atlanta, Georgia;
9. Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania;
10. Division of Pulmonary and Critical Care Medicine, Dartmouth College, Hanover, New Hampshire;
11. Division of Pulmonary and Critical and Sleep Medicine, University of California, San Diego, California;
12. Division of Pulmonary and Critical Care Medicine, University of Arizona, Tucson, Arizona;
13. Oxford Centre for Respiratory Medicine, Oxford University Hospitals, Oxford, United Kingdom; and
14. Division of Allergy, Pulmonary, and Critical Care Medicine, Vanderbilt University Medical Center, Nashville, Tennessee