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First case of COVID-19 in Japan suggested the occurrence of nosocomial COVID-19 infection in Wuhan city in China [Internet]. 2020 Jul 7 [cited 2020 Nov 17]. Available from: https:\/\/www.niid.go.jp\/niid\/ja\/diseases\/ka\/corona-virus\/2019-ncov\/2488-idsc\/iasr-news\/9729-485p04.html"},{"key":"11","doi-asserted-by":"crossref","unstructured":"11. McLean HQ, Thompson MG, Sundaram ME, et al. Impact of repeated vaccination on vaccine effectiveness against influenza A (H3N2) and B during 8 seasons. Clin Infect Dis. 2014 Nov;59 (10):137513-85.","DOI":"10.1093\/cid\/ciu680"},{"key":"12","doi-asserted-by":"crossref","unstructured":"12. Ramsay LC, Buchan SA, Stirling RG, et al. The impact of repeated vaccination on influenza vaccine effectiveness: A systematic review and meta-analysis. BMC Med. 2017 Aug;15:159.","DOI":"10.1186\/s12916-017-0919-0"},{"key":"13","doi-asserted-by":"crossref","unstructured":"13. Shinjoh M, Sugaya N, Yamaguchi Y, et al. 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