title: [Before treating COPD, do you have lung function consistent with this diagnosis?].
authors.forename: Nicolas
authors.initials: N
authors.lastname: Blondel
mesh_terms: D006801:Humans; D029424:Pulmonary Disease, Chronic Obstructive / Q000175:diagnosis* / Q000503:physiopathology / Q000628:therapy; D012129:Respiratory Function Tests / Q000379:methods*; D012189:Retrospective Studies; D015983:Selection Bias