1. Division of Pulmonary and Critical Care Medicine, and
2. Center for the Study of Healthcare Innovation, Implementation, and Policy, Health Services Research and Development, Greater Los Angeles Veterans Affairs Healthcare System, Los Angeles, California;
3. Collaborative Studies Coordinating Center, Department of Biostatistics, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina;
4. Division of Genetics, Genomics, and Precision Medicine, University of Arizona, Tucson, Arizona;
5. Division of Pulmonary and Critical Care Medicine, University of Michigan School of Medicine, Ann Arbor, Michigan;
6. Medical Service, Veterans Affairs Ann Arbor Healthcare System, Ann Arbor, Michigan;
7. Division of Pulmonary and Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland;
8. Breathe Chicago Center, Division of Pulmonary and Critical Care Medicine, University of Illinois at Chicago College of Medicine, Chicago, Illinois;
9. Division of Pulmonary and Critical Care Medicine, Columbia University College of Physicians and Surgeons, New York, New York;
10. Division of Pulmonary and Critical Care Medicine, University of California, San Francisco, California;
11. Division of Respiratory, Critical Care, and Occupational Medicine, University of Utah School of Medicine, Salt Lake City, Utah;
12. Veterans Affairs Salt Lake City Healthcare System, Salt Lake City, Utah; and
13. Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska
14. Department of Physiology, David Geffen School of Medicine, University of California, Los Angeles, California;