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Risk factors for anal sphincter tear in multiparas.
DiPiazza D, Richter HE, Chapman V, Cliver SP, Neely C, Chen CC, Burgio KL. DiPiazza D, et al. Obstet Gynecol. 2006 Jun;107(6):1233-7. doi: 10.1097/01.AOG.0000217696.25548.ff. Obstet Gynecol. 2006. PMID: 16738146