Asthma's changing prevalence.
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D001249:Asthma / Q000175:diagnosis / Q000453:epidemiology*; D002648:Child; D004739:England / Q000453:epidemiology; D006801:Humans; D015995:Prevalence; D012135:Respiratory Sounds / Q000209:etiology; D014852:Wales / Q000453:epidemiology