1. Johns Hopkins University School of Medicine, Baltimore, Maryland;
2. Center for Clinical Trials and Evidence Synthesis, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland;
3. Lewis Katz School of Medicine at Temple University, Philadelphia, Pennsylvania;
4. Division of Pulmonary and Critical Care Medicine, University of Alabama at Birmingham, Birmingham, Alabama;
5. Division of Pulmonary and Critical Care Medicine, University of Vermont College of Medicine, Burlington, Vermont;
6. Division of Pulmonary Medicine, Weill Cornell School of Medicine, New York, New York;
7. Division of Pulmonary and Critical Care Medicine, University of California, San Francisco, San Francisco, California;
8. Division of Pulmonary, Critical Care and Sleep Medicine, National Jewish Health, Denver, Colorado; and
9. Department of Medicine, Duke University School of Medicine, Durham, North Carolina