title: Aetiology of childhood leukaemia.
mesh_terms: D002648:Child; D002675:Child, Preschool; D004739:England; D006801:Humans; D007223:Infant; D007226:Infant Mortality; D007938:Leukemia / Q000209:etiology*; D012606:Scotland; D012621:Seasons; D014611:Vaccination / Q000009:adverse effects*; D014852:Wales