RT Journal Article SR Electronic(1) A1 Wiese-Posselt, M A1 Hellenbrand, W YR 2010 T1 Changes to the varicella and pertussis immunisation schedule in Germany 2009: Background, rationale and implementation JF Eurosurveillance VO 15 IS 16 SP 19548 OP DO https://doi.org/10.2807/ese.15.16.19548-en UL https://www.eurosurveillance.org/content/10.2807/ese.15.16.19548-en