From the Firestone Institute for Respiratory Health, St. Joseph’s Healthcare and Department of Medicine, Michael G. DeGroote School of Medicine, McMaster University, Hamilton, ON (P.M.O.), and the Institute for Heart and Lung Health, University of British Columbia, Vancouver (J.M.F.) — both in Canada; the Division of Pulmonology, Department of Medicine, University of Cape Town, Cape Town, South Africa (E.D.B.); Airway Disease Section, National Heart and Lung Institute, Imperial College, London (P.J...(2018-05-17時点)