title: Age of entry to nursery and allergies in later life.
authors.forename: B
authors.initials: B
authors.lastname: Xu
authors.forename: J
authors.initials: J
authors.lastname: Pekkanen
mesh_terms: D000293:Adolescent; D000367:Age Factors; D002648:Child; D002656:Child Day Care Centers; D002675:Child, Preschool; D015986:Confounding Factors, Epidemiologic; D006801:Humans; D006967:Hypersensitivity / Q000453:epidemiology* / Q000209:etiology; D007223:Infant; D012307:Risk Factors