Comparison of oestradiol and prostaglandin E2 vaginal gel for ripening the unfavourable cervixBr Med J (Clin Res Ed) 1981; 282 doi: https://doi.org/10.1136/bmj.282.6278.1797-c (Published 30 May 1981) Cite this as: Br Med J (Clin Res Ed) 1981;282:1797
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