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Márquez-Martín E, Quintana-Gallego E, López-Campos JL.Márquez-Martín E, et al.Arch Bronconeumol. 2010 Jan;46(1):35-9. doi: 10.1016/j.arbres.2009.04.008. Epub 2009 Jun 11.Arch Bronconeumol. 2010.PMID: 19523729Spanish.