双管法与单管法硬膜外分娩镇痛对胎头位置异常初产妇分娩结局影响的比较
쌍관법여단관법경막외분면진통대태두위치이상초산부분면결국영향적비교
Comparison of double-versus single-catheter labor epidural analgesia for delivery outcomes of primiparae with abnormal fetal head position
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