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Alvarez-Lerma F, Gracia-Arnillas MP, Palomar M, Olaechea P, Insausti J, López-Pueyo MJ, Otal JJ, Gimeno R, Seijas I; Grupo de Investigadores del Estudio Nacional de Vigilancia de Infección Nosocomial en UCI.Alvarez-Lerma F, et al.Med Intensiva. 2013 Mar;37(2):75-82. doi: 10.1016/j.medin.2012.02.013. Epub 2012 May 11.Med Intensiva. 2013.PMID: 22579562Free article.English, Spanish.