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Cullimore JE, Luesley DM, Rollason TP, Byrne P, Buckley CH, Anderson M, Williams DR, Waddell C, Hudson E, Shafi MI.Cullimore JE, et al. Among authors: shafi mi.Br J Obstet Gynaecol. 1992 Apr;99(4):314-8. doi: 10.1111/j.1471-0528.1992.tb13730.x.Br J Obstet Gynaecol. 1992.PMID: 1316142Clinical Trial.