1 University of British Columbia, Medicine, Vancouver, British Columbia, Canada.
2 University of Washington, Division of Pulmonary, Critical Care and Sleep Medicine, Seattle, Washington, United States.
3 Providence VA Medical Center, Medicine , Providence, Rhode Island, United States.
4 Brown University, Medicine, Providence, Rhode Island, United States.
5 University of Washington Medical Center, Division of Pulmonary and Critical Care Medicine, Seattle, Washington, United States.
6 New York University Langone Health, Epidemiology and Biostatistics, New York, New York, United States.
7 Ottawa Hospital Research Institute, Ottawa, Ontario, Canada.
8 Indiana University School of Medicine, Pediatric Pulmonology, Allergy, and Sleep Medicine, Indianapolis, Indiana, United States.
9 Yale University, Pulmonary and Critical Care Medicine, New Haven, Connecticut, United States.
10 University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States.
11 Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, United States.
12 University of Texas-M.D. Anderson Cancer Center, Pulmonary Medicine, Houston, Texas, United States.
13 Dartmouth-Hitchcock Medical Center, Pulmonary/Critical Care Division, Lebanon, New Hampshire, United States.
14 Children's Hospital Los Angeles, Los Angeles, United States.
15 McGill University, Clinical Exercise and Respiratory Physiology Laboratory, Department of Kinesiology and Physical Education, Montreal, Quebec, Canada.
16 Monash University Central Clinical School, Allergy, Clinical Immunology and Respiratory Medicine, Melbourne, Victoria, Australia.
17 Institute for Breathing and Sleep, Melbourne, Victoria, Australia.
18 Alfred Health, Physiotherapy, Melbourne, Victoria, Australia.
19 Stanford University, School of Medicine, Stanford, California, United States.
20 University of Illinois at Chicago, Chicago, Illinois, United States.
21 Salem VAMC, Pulmonary/Critical Care/Sleep/Palliative, Salem, Virginia, United States.
22 University of Virginia, Medicine, Charlottesville, Virginia, United States.
23 San Diego State University, San Diego, California, United States.
24 University of California San Diego, Division of Pulmonary, Critical Care and Sleep Medicine, La Jolla, California, United States.