Implementation of MenACWY vaccination because of ongoing increase in serogroup W invasive meningococcal disease, the Netherlands, 2018 Knol, Mirjam J and Ruijs, Wilhelmina LM and Antonise-Kamp, Laura and de Melker, Hester E and van der Ende, Arie, Eurosurveillance, 23, 18-00158 (2018), https://doi.org/10.2807/1560-7917.ES.2018.23.16.18-00158