title: Rebuttal From Dr O'Byrne.
authors.affiliation: Firestone Institute of Respiratory Health and the Department of Medicine, Michael G. DeGroote School of Medicine, McMaster University, Hamilton, ON, Canada. Electronic address: obyrnep@mcmaster.ca.
authors.forename: Paul M
authors.initials: PM
authors.lastname: O'Byrne
mesh_terms: D001249:Asthma; D006801:Humans; D008991:Monitoring, Physiologic