Epidemiology of new influenza A(H1N1) in the United Kingdom, April-May 2009
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Eurosurveillance, Volume 14, Issue 19, 14 May 2009
http://www.eurosurveillance.org/ViewArticle.aspx?ArticleId=19213
http://www.eurosurveillance.org/ViewArticle.aspx?ArticleId=19213