左旋布比卡因复合不同剂量舒芬太尼术后硬膜外自控镇痛临床对比研究
좌선포비잡인복합불동제량서분태니술후경막외자공진통림상대비연구
Clinical comparative study on Levobupivacaine composite of different doses of Sufentanil for postoperative epidural controlled analgesia
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