title: Effectiveness of ward based opportunistic immunisation policy.
authors.forename: H
authors.initials: H
authors.lastname: Reeve
authors.forename: C
authors.initials: C
authors.lastname: Chew
authors.forename: I
authors.initials: I
authors.lastname: Waller-Wilkinson
mesh_terms: D002675:Child, Preschool; D004739:England; D006760:Hospitalization; D006801:Humans; D007114:Immunization; D007223:Infant