title: COVER in Wales: May 1987-February 1993.
authors.forename: A H
authors.initials: AH
authors.lastname: Biffin
authors.forename: S R
authors.initials: SR
authors.lastname: Palmer
mesh_terms: D002675:Child, Preschool; D006801:Humans; D007223:Infant; D008457:Measles / Q000517:prevention & control; D014611:Vaccination / Q000706:statistics & numerical data*; D014852:Wales