不同浓度舒芬太尼复合罗哌卡因用于分娩镇痛的临床研究
불동농도서분태니복합라고잡인용우분면진통적림상연구
Randomized and double blindness clincal trail for different-dose sufentanil combined with ropivacaine on epidural analgesia for labor pain relief
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