Spotlight influenza: The 2019/20 influenza season and the impact of COVID-19 on influenza surveillance in the WHO European Region Adlhoch, Cornelia and Sneiderman, Miriam and Martinuka, Oksana and Melidou, Angeliki and Bundle, Nick and Fielding, James and Olsen, Sonja J and Penttinen, Pasi and Pastore, Lucia and Pebody, Richard and the European Influenza Surveillance Network, Eurosurveillance, 26, 2100077 (2021), https://doi.org/10.2807/1560-7917.ES.2021.26.40.2100077