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Di Castro Stringher P, Espinosa de los Monteros Mena A, Hernández Vazquez J, Parra Covarrubias A, Kably Ambe A, Alvarado Duran A.Di Castro Stringher P, et al.Ginecol Obstet Mex. 1992 Apr;60:120-6.Ginecol Obstet Mex. 1992.PMID: 1601316Spanish.