硬膜外不同浓度左旋布比卡因复合七氟醚全麻用于老年食管癌手术的研究
경막외불동농도좌선포비잡인복합칠불미전마용우노년식관암수술적연구
Study of among elderly patients undergoing esophageal carcinoma surgery under combined different concentration levobupivacaine and sevoflurane general anesthesia
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