Letter to the editor: Influenza vaccine effectiveness: heterogeneity in estimates for the 2012/13 season
van der Hoek, W and Dijkstra, F and de Lange, M M and Donker, G A and Meijer, A and van der Sande, M A, Eurosurveillance, 18, 20399 (2013), https://doi.org/10.2807/ese.18.07.20399-en