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Puzelli S, Facchini M, De Marco MA, Palmieri A, Spagnolo D, Boros S, Corcioli F, Trotta D, Bagnarelli P, Azzi A, Cassone A, Rezza G, Pompa MG, Oleari F, Donatelli I. Molecular surveillance of pandemic influenza A(H1N1) viruses circulating in Italy from May 2009 to February 2010: association between haemagglutinin mutations and clinical outcome. Euro Surveill 2010;15(43)\par \par }