1. Division of Pulmonary and Critical Care, University of California, San Francisco, California
2. Department of Pulmonary Diseases, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
3. Marsico Lung Institute, University of North Carolina, Chapel Hill, North Carolina
4. Respiratory Biomedical Research Unit, Leicester, United Kingdom
5. Division of Pulmonary and Critical Care, University of Michigan, Ann Arbor, Michigan
6. Division of Pulmonary and Critical Care, Washington University, St. Louis, Missouri
7. Department of Medicine and
8. Division of Oncology, National Jewish Health, Denver, Colorado
9. Division of Pulmonary and Sleep Medicine, University of Arizona, Tucson, Arizona
10. Woolcock Institute of Medical Research, University of Sydney, Sydney, New South Wales, Australia
11. Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada
12. Department of Medicine, Harvard Medical School, Boston, Massachusetts
13. Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
14. Division of Lung Diseases, NHLBI/National Institutes of Health, Bethesda, Maryland; and
15. Division of Pulmonary and Critical Care, Johns Hopkins University, Baltimore, Maryland