Estimated age-standardized cumulative incidence of pandemic H1N1 influenza infection in ten studiesa.
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aTwo of 12 studies were excluded due to the selective sample (only pregnant women) in the Canadian study [57] and the small sample size in one Hong Kong study [58].bAge-standardized cumulative incidence in the region of London and the West Midlands was used, as there was minimal pH1N1 circulation in other regions [4].
创建时间：
2015-12-02
