1 The Ottawa Hospital Research Institute, Department of Medicine, University of Ottawa, Ottawa, Ontario, Canada.
2 Universidad Central de Venezuela, Caracas, Venezuela.
3 Hospital Centro Médico de Caracas, Caracas, Venezuela.
4 Pulmonary and Critical Care Medicine and.
5 Pulmonary, Allergy and Critical Care Medicine, University of Alabama at Birmingham, Birmingham, Alabama.
6 Department of Medicine, McGill University, Montreal, Quebec, Canada.
7 Lewis Katz School of Medicine at Temple University, Philadelphia, Pennsylvania.
8 Channing Division of Network Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts.
9 University of Exeter Medical School, University of Exeter, Exeter, United Kingdom.
10 Division of Pulmonary & Critical Care, University of Michigan, Ann Arbor, Michigan.
11 UCL Respiratory, University College London, London, United Kingdom.
12 Division of Pulmonary and Critical Care, Weill Cornell Medicine, New York, New York.
13 College of Medicine, University of Kentucky, Lexington, Kentucky.
14 Department of Clinical Pharmacy & Pharmacology, University Medical Center Groningen, Groningen Research Institute for Asthma and COPD, University of Groningen, Groningen, The Netherlands.
15 Philipps-Universität Marburg, German Center for Lung Research, Marburg, Germany.
16 National Heart and Lung Institute, Imperial College London, London, United Kingdom.
17 Department of Family Medicine and Community Health, University of Minnesota, Minneapolis, Minnesota; and.