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Meta-analysis of effect estimates from identified studies reporting the relative vaccine effectiveness of aTIV vs. HD-TIV for prevention of influenza-related hospitalizations (or composite outcomes including influenza-related hospital admissions). Study pooling weights were calculated based on DerSimonian and Laird random-effects meta-analysis [41]. Abbreviations: CI = confidence interval; ED = emergency department; GP = general practitioner; rVE = relative vaccine effectiveness.
