1. World Health Organization (WHO). Influenza (Seasonal). Geneva: WHO, 2018. https://www.who.int/news-room/fact-sheets/detail/influenza-(seasonal). Accessed 14 March 2022
2. Estimates of global seasonal influenza-associated respiratory mortality: a modelling study;Iuliano;Lancet,2018
3. The evolution of seasonal influenza viruses;Petrova;Nat Rev Microbiol,2018
4. European Commission. Proposal for a council recommendation on seasonal influenza vaccination. Brussels: Commission of the European Communities, 2009. https://op.europa.eu/en/publication-detail/-/publication/99fdfdb9-ce99-4064-9711-44385d555c1b/language-en. Accessed 14 March 2022
5. Prevention and control of seasonal influenza with vaccines: recommendations of the advisory committee on immunization practices-United States, 2018-19 influenza season;Grohskopf;MMWR Recomm Rep Morb Mortal wkly Rep Recomm Rep,2018