比较罗哌卡因复合与不复合舒芬太尼硬膜外规律间断注药用于分娩镇痛的临床效果
비교라고잡인복합여불복합서분태니경막외규률간단주약용우분면진통적림상효과
Comparing the analgesic efficacy of ropivacaine with and without sufentanil epidural regular intermittent injection in parturients during labor
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