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Ao A, Handyside A, Winston RM.Ao A, et al. Among authors: winston rm.Eur J Obstet Gynecol Reprod Biol. 1996 Mar;65(1):7-10. doi: 10.1016/0028-2243(95)02294-3.Eur J Obstet Gynecol Reprod Biol. 1996.PMID: 8706961Review.