中国计划生育学杂志
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无保护会阴分娩初产妇会阴裂伤的危险因素分析
浙江省杭州市妇产科医院(31009)
Analysis of risk factors of perineal laceration of primipara during unprotected transvaginal delivery
Hangzhou Obstetrics and Gynecology Hospital, Hangzhou, Zhejiang Province, 310009