Letter to the editor: Regarding the editorial by Penttinen and Friede
Fry, Alicia M and Flannery, Brendan and Olsen, Sonja J and Grohskopf, Lisa and Bresee, Joseph, Eurosurveillance, 21, 30366 (2016), https://doi.org/10.2807/1560-7917.ES.2016.21.40.30366