1. Division of Pulmonary Diseases and Critical Medicine, and
2. Department of Environmental and Occupational Health Sciences, School of Public Health, and
3. Marsico Lung Institute/Cystic Fibrosis Research Center, Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
4. Division of Pulmonary, Critical Care, Sleep and Allergy, Department of Medicine and Cardiovascular Research Institute, University of California San Francisco, School of Medicine, San Francisco, California
5. Division of Pulmonary, Critical Care, Sleep, and Allergy, University of Illinois, Chicago, Illinois
6. Department of Medicine, Columbia University Medical Center, New York, New York
7. Division of Pulmonary and Critical Care Medicine, University of Michigan Health System, Ann Arbor, Michigan
8. Department of Medicine, Weill Cornell Medical College, New York-Presbyterian Hospital/Weill Cornell Medical Center, New York, New York
9. Division of Pulmonary and Critical Care, University of Iowa, Iowa City, Iowa
10. Division of Pulmonary and Critical Care, University of Washington, Seattle, Washington
11. Division of Pulmonary and Critical Care, University of Alabama at Birmingham, Birmingham, Alabama
12. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, University of Utah, Salt Lake City, Utah
13. Division of Pulmonary, Critical Care, Allergy and Immunologic Diseases, Wake Forest University, Winston-Salem, North Carolina; and
14. Division of Pulmonary and Critical Care Medicine, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland