低剂量罗哌卡因舒芬太尼自控硬膜外分娩镇痛不同设置的效果
저제량라고잡인서분태니자공경막외분면진통불동설치적효과
Low-dose ropivacaine plus sufentanil for parturient-controlled epidural analgesia during labor: effects of varying regimens on analgesia
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