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Reina J, Gimenez J; Red Centinela de Vigilancia de la Gripe en Baleares.Reina J, et al.Enferm Infecc Microbiol Clin. 2011 Mar;29(3):240-2. doi: 10.1016/j.eimc.2010.11.003. Epub 2011 Feb 22.Enferm Infecc Microbiol Clin. 2011.PMID: 21345529Spanish.No abstract available.