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Sampselle CM, Miller JM, Mims BL, Delancey JO, Ashton-Miller JA, Antonakos CL.Sampselle CM, et al.Obstet Gynecol. 1998 Mar;91(3):406-12. doi: 10.1016/s0029-7844(97)00672-8.Obstet Gynecol. 1998.PMID: 9491869Clinical Trial.