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Rop ivacaine 0. 25% versus bup ivacaine 0. 25% for continuous ep idural analgesia in labor: a double blind comparison. Stienstra R,Jonker T,Bourdrez P,et al. Anesthesia and Analgesia . 1995
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Comparson ofm idwife top-ups,continuous infusion and patient-controlled ep idural analgesia for maintaining mobility after a low-dose combined sp inal-ep idural. Collis RE,Plaat FS,Morgan BM. British Journal of Anaesthesia . 1999