单纯罗哌卡因用于第一产程潜伏期硬膜外分娩镇痛的临床观察
단순라고잡인용우제일산정잠복기경막외분면진통적림상관찰
Clinical observation of epidural analgesia for labor in the incubation period of the first stage using ropivacaine alone
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