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Gurtcheff SE, Turok DK, Stoddard G, Murphy PA, Gibson M, Jones KP.Gurtcheff SE, et al. Among authors: turok dk.Obstet Gynecol. 2011 May;117(5):1114-1121. doi: 10.1097/AOG.0b013e3182165ee8.Obstet Gynecol. 2011.PMID: 21508750Clinical Trial.