European public health policies for managing contacts of invasive meningococcal disease cases better harmonised in 2013 than in 2007 Vygen, Sabine and Hellenbrand, Wiebke and Stefanoff, Pawel and Hanquet, Germaine and Heuberger, Sigrid and Stuart, James, Eurosurveillance, 21, 30125 (2016), https://doi.org/10.2807/1560-7917.ES.2016.21.5.30125