Præventis, the immunisation register of the Netherlands: a tool to evaluate the National Immunisation Programme van Lier, A and Oomen, P and de Hoogh, P and Drijfhout, I and Elsinghorst, B and Kemmeren, J and Conyn-van Spaendonck, M and de Melker, H, Eurosurveillance, 17, 20153 (2012), https://doi.org/10.2807/ese.17.17.20153-en