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Letter to the editor: influenza vaccine effectiveness: heterogeneity in estimates for the 2012/13 season.

Hoek, W. van der, Dijkstra, F., Lange, M.M. de, Donker, G.A., Meijer, A., Sande, M.A. van der. Letter to the editor: influenza vaccine effectiveness: heterogeneity in estimates for the 2012/13 season. Eurosurveillance: 2013, 18(7)
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To the editor
In the past few weeks, there have been several publications on influenza vaccine effectiveness (VE) during the 2012/13 influenza season. Having robust VE estimates as soon as possible during the season is of great public health benefit. Indeed, to optimise the design of such studies and increase the precision of (early) estimates by pooling of data, the European Centre for Disease Prevention and Control (ECDC) has supported the European Influenza Monitoring Vaccine Effectiveness in Europe (I-MOVE) network. However, the recently published studies provide very different estimates [...]