title: Confounders are always a problem.
authors.forename: A J
authors.initials: AJ
authors.lastname: Brunskill
mesh_terms: D002675:Child, Preschool; D015986:Confounding Factors, Epidemiologic; D006801:Humans; D008457:Measles / Q000453:epidemiology / Q000401:mortality / Q000517:prevention & control; D008458:Measles Vaccine / Q000276:immunology*
chemical_list: D008458:Measles Vaccine