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Moreno-Perez D, Calvo C; Five Study Group.Moreno-Perez D, et al.Influenza Other Respir Viruses. 2014 Mar;8(2):209-16. doi: 10.1111/irv.12224. Epub 2014 Jan 2.Influenza Other Respir Viruses. 2014.PMID: 24382343Free PMC article.