%0 Journal Article %A De Serres, G %A Skowronski, D M %A Wu, X W %A Ambrose, C S %T The test-negative design: validity, accuracy and precision of vaccine efficacy estimates compared to the gold standard of randomised placebo-controlled clinical trials %D 2013 %J Eurosurveillance %V 18 %N 37 %P 20585 %R doi:https://doi.org/10.2807/1560-7917.ES2013.18.37.20585 %K vaccine effectiveness %U https://www.eurosurveillance.org/content/10.2807/1560-7917.ES2013.18.37.20585