左旋布比卡因与布比卡因用于老年患者股骨头置换术后镇痛的比较
좌선포비잡인여포비잡인용우노년환자고골두치환술후진통적비교
Comparison of postoperative analgesia with continuous epidural infusion of fentanyl combined levobupivacaine or bupivacaine in elderly patients undergoing femoral head replacement
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