title: Defining airflow obstruction.
authors: Nuffield Dept of Primary Care Health Sciences, University of Oxford, Oxford, UK.
authors: Margaret
authors: M
authors: Smith
authors: Clinical Trial Service Unit and Epidemiological Studies Unit (CTSU), University of Oxford, Oxford, UK.
authors: Om
authors: O
authors: Kurmi
mesh_terms: D001249:Asthma / Q000175:diagnosis* / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D029424:Pulmonary Disease, Chronic Obstructive / Q000175:diagnosis* / Q000453:epidemiology*