Safety and impact on training of the influenza vaccines in elite athletes participating in the Rio 2016 Olympics - Krzywanski, J.; Kuchar, E.; Pokrywka, A.; Mikulski, T.; Pilchowska, I.; Mlynczak, M.; Krysztofiak, H.; Jurczyk, J.; Ziemba, A.; Nitsch-Osuch, A. (Clinical Journal of Sport Medicine, 2021)