Improving influenza virological surveillance in Europe: strain-based reporting of antigenic and genetic characterisation data, 11 European countries, influenza season 2013/14 Broberg, Eeva and Hungnes, Olav and Schweiger, Brunhilde and Prosenc, Katarina and Daniels, Rod and Guiomar, Raquel and Ikonen, Niina and Kossyvakis, Athanasios and Pozo, Francisco and Puzelli, Simona and Thomas, Isabelle and Waters, Allison and Wiman, Åsa and Meijer, Adam, Eurosurveillance, 21, 30370 (2016), https://doi.org/10.2807/1560-7917.ES.2016.21.41.30370