Nasopharyngeal carriage of pneumococci four years after community-wide vaccination with PCV-7 in The Gambia: long-term evaluation of a cluster randomized trial. by Anna Roca, Michel M Dione, Abdoulie Bojang, John Townend, Uzochukwu Egere, Ousainou Darboe, Stephen R C Howie, Philip C Hill, Richard A Adegbola, Brian M Greenwood, Martin Antonio

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