Assessing varicella vaccine effectiveness and its influencing factors using health insurance claims data, Germany, 2006 to 2015 Rieck, Thorsten and Feig, Marcel and an der Heiden, Matthias and Siedler, Anette and Wichmann, Ole, Eurosurveillance, 22, 30521 (2017), https://doi.org/10.2807/1560-7917.ES.2017.22.17.30521