PLoS Medicine
(Accessed 10 April 2011)
http://medicine.plosjournals.org/perlserv/?request=browse&issn=1549-1676&method=pubdate&search_fulltext=1&order=online_date&row_start=1&limit=10&document_count=1533&ct=1&SESSID=aac96924d41874935d8e1c2a2501181c#results

Effect of Pneumococcal Conjugate Vaccination on Serotype-Specific Carriage and Invasive Disease in England: A Cross-Sectional Study
Stefan Flasche, Albert Jan Van Hoek, Elizabeth Sheasby, Pauline Waight, Nick Andrews, Carmen Sheppard, Robert George, Elizabeth Miller Research Article, published 05 Apr 2011
doi:10.1371/journal.pmed.1001017