title: The natural history of severe asthma in childhood.
mesh_terms: D000328:Adult; D000367:Age Factors; D001249:Asthma / Q000453:epidemiology* / Q000401:mortality / Q000628:therapy; D002648:Child; D002675:Child, Preschool; D004739:England; D006801:Humans; D012737:Sex Factors