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Association between the 2008–09 Seasonal Influenza Vaccine and Pandemic H1N1 Illness during Spring–Summer 2009: Four Observational Studies from Canada

Table 1

Summary of study design, sample size and outcomes applied in evaluating the association between 2008–09 TIV receipt and pH1N1 risk.

Table 1

doi: https://doi.org/10.1371/journal.pmed.1000258.t001