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Mollers M, Barnadas C, Broberg EK, Penttinen P; European Influenza Surveillance Network; Teirlinck AC, Fischer TK; Members of the European Influenza Surveillance network (EISN).Mollers M, et al.Euro Surveill. 2019 Oct;24(40):1900157. doi: 10.2807/1560-7917.ES.2019.24.40.1900157.Euro Surveill. 2019.PMID: 31595876Free PMC article.