title: Measuring and quantifying acute exacerbations of COPD: pitfalls and practicalities.
authors.affiliation: University of Ottawa, Ottawa, ON, Canada.
authors.forename: Shawn D
authors.initials: SD
authors.lastname: Aaron
mesh_terms: D005260:Female; D006801:Humans; D008297:Male; D029424:Pulmonary Disease, Chronic Obstructive / Q000175:diagnosis* / Q000503:physiopathology*