We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleEvidence of bias in estimates of influenza vaccine effectiveness in seniors.AuthorsJackson LA; Jackson ML; Nelson JC; Neuzil KM; Weiss NSPublicationInternational journal of epidemiology, 2006, Vol 35, Issue 2, p337ISSN0300-5771Publication typearticleDOI10.1093/ije/dyi274