Recent years because the late marriage, advanced age childbirth's increase, its formation rate seemed to be the trend of escalation.
近年由于晚婚、高龄分娩的增多，其发生率似有上升趋势。
Recent years because the late marriage, advanced age childbirth's increase, its formation rate seemed to be the trend of escalation.
近年由于晚婚、高龄分娩的增多，其发生率似有上升趋势。
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