title: Effect of the 13-valent pneumococcal conjugate vaccine on invasive pneumococcal disease in England and Wales 4 years after its introduction: an observational cohort study.
authors.forename: Pauline A
authors.initials: PA
authors.lastname: Waight
authors.forename: Nicholas J
authors.initials: NJ
authors.lastname: Andrews
authors.forename: Nicholas J
authors.initials: NJ
authors.lastname: Ladhani
authors.forename: Carmen L
authors.initials: CL
authors.lastname: Sheppard
authors.forename: Mary P E
authors.initials: MP
authors.lastname: Slack
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Miller