Ongoing outbreak with well over 4,000 measles cases in Italy from January to end August 2017 − what is making elimination so difficult? Filia, Antonietta and Bella, Antonino and Del Manso, Martina and Baggieri, Melissa and Magurano, Fabio and Rota, Maria Cristina, Eurosurveillance, 22, 30614 (2017), https://doi.org/10.2807/1560-7917.ES.2017.22.37.30614