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Iglesias-Román N, Alvarez T, Bravol C, Pérez R, Gámez F, De León Luis J.Iglesias-Román N, et al.Ginecol Obstet Mex. 2014 Sep;82(9):627-33.Ginecol Obstet Mex. 2014.PMID: 25412557Review.Spanish.