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BenhamouD, MercierFJ, BenAyedM, AuroyY. Continuous epidural analgesia with bupivacaine 0.125% or bupivacaine 0.0625% plus sufentanil 0.25 μg ml−1: a study in singleton breech presentation.Int J Obstet Anesth2002; 11: 13–18.