Ruszel, K. and Piecewicz-Szczęsna, H. (2020) “Are we still afraid of influenza during the Sars-Cov2 pandemic? - epidemiological analysis of influenza morbidity and vaccination in the 2019/2020 season”, Journal of Education, Health and Sport, 10(8), pp. 22–31. doi: 10.12775/JEHS.2020.10.08.003.