High number of hospitalisations and non-classical presentations: lessons learned from a measles outbreak in 2017, Belgium., Cornelissen, Laura, Grammens Tine, Leenen S, Schirvel C, Hutse Veronik, Demeester R, Swennen B, Asikainen T, and Wyndham-Thomas Chloé , Epidemiol Infect, 2020 02 24, Volume 148, (2020)