00511nas a2200181   4500000000100000000000100001008004100002100001600043700001800059700001500077700001500092700001300107700001200120245014800132300000900280490000800289022003200297       2004                            d1 aP. Mangtani1 aP. Cumberland1 aC. Hodgson1 aJ. Roberts1 aF. Cutts1 aA. Hall00aA cohort study of the effectiveness of influenza vaccine in older people, performed using the United Kingdom general practice research database  a1-100 v190  a0022-1899 (Print) 0022-1899