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Sepúlveda SE, Beltrán CJ, Peralta A, Rivas P, Rojas N, Figueroa C, Quera R, Hermoso MA.Sepúlveda SE, et al.Rev Med Chil. 2008 Mar;136(3):367-75. Epub 2008 Jun 3.Rev Med Chil. 2008.PMID: 18575665Free article.Review.Spanish.