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Post-suckling prolactin:oestradiol ratio--a potential index to predict the duration of lactational amenorrhoea in women.  Hum Reprod 12(7):1421-6 1997. Cloning and expression in Escherichia coli of genetic determinants for production of and immunity to microcin E492 from Klebsiella pneumoniae.  J Bacteriol 179(15):4789-94 1997. Discontinuation of antimicrobial therapy for febrile, neutropenic children with cancer: a prospective study.  Clin Infect Dis 25(1):92-7 1996. [Incidence of congenital cytomegalovirus infection in newborn infants of different socioeconomic strata].  Rev Med Chil 124(4):403-8 1996. [Antigenic and genomic characterization of Herpes simplex virus isolated from double genital infections].  Rev Med Chil 124(2):153-9 1995. [Progression of viral infection in twins born from a mother infected with human immunodeficiency virus].  Rev Med Chil 123(10):1189-98 1995. Studies of natural killer cell activity in a drug-free, healthy population. 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