罗哌卡因复合小剂量芬太尼硬膜外神经阻滞用于分娩镇痛的临床研究
라고잡인복합소제량분태니경막외신경조체용우분면진통적림상연구
Clinical research of delivery analgesia with ropivacaine and minute dose of fentanyl
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