[Is primiparity, the only risk factor for type 3 and 4 perineal injury, during delivery?].
Gynecologie, obstetrique & fertilite(2007)
摘要
Primiparity is not the only risk factor of perineal injuries. Other risk factors have been found: assisted-extraction, occiput posterior fetal head position, and association episiotomy and assisted-extraction. Black origin seems to be protective.
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