Childhood asthma appears to be increasing: but how good is the evidence?
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D000293:Adolescent; D000328:Adult; D017668:Age of Onset; D001249:Asthma / Q000453:epidemiology* / Q000517:prevention & control; D002648:Child; D002675:Child, Preschool; D006801:Humans; D009017:Morbidity; D015995:Prevalence