1. Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine University of Alabama at Birmingham Birmingham AL USA
2. Department of Epidemiology University of Alabama at Birmingham Birmingham AL USA
3. Channing Division of Network Medicine Brigham and Women's Hospital Boston MA USA
4. Division of Pulmonary and Critical Care Medicine Brigham and Women's Hospital Boston MA USA
5. Veterans Affairs Boston Health Care System, Jamaica Plain Boston MA USA
6. Department of Internal Medicine, Section on Pulmonary, Critical Care, Allergy and Immunologic Diseases Wake Forest School of Medicine Winston‐Salem NC USA
7. Division of Pulmonary, Critical Care, Allergy, & Sleep Medicine, Department of Medicine University of California San Francisco San Francisco CA USA
8. Department of Medicine University of Arizona College of Medicine Tucson AZ USA
9. Department of Population Medicine Harvard Medical School Boston MA USA
10. Rehabilitation Clinical Trials Center Los Angeles Biomedical Research Institute at Harbor Harbor‐UCLA Medical Center Torrance CA USA
11. Department of Medicine Nebraska Medical Center Omaha NE USA
12. UCL Respiratory University College London London UK
13. Division of Pulmonary and Critical Care Medicine University of Michigan Ann Arbor MI USA
14. COPD Foundation Miami FL USA
15. Department of Medicine, Division of Pulmonary, Critical Care & Sleep Medicine National Jewish Health Denver CO USA
16. Department of Biostatistics University of Alabama at Birmingham Birmingham AL USA
17. Department of Cell Development and Integrative Biology University of Alabama at Birmingham Birmingham AL USA
18. Department of Genetics University of Alabama at Birmingham Birmingham AL USA