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Peña-Vázquez E, Villanueva-Alonso J, Bermejo-Barrera A, Bermejo-Barrera P.Peña-Vázquez E, et al.J Environ Monit. 2006 Jun;8(6):641-8. doi: 10.1039/b600472e. Epub 2006 May 12.J Environ Monit. 2006.PMID: 16767232