中国计划生育学杂志
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不同超声方法在妊娠中期测量不同形态宫颈长度应用
广西壮族自治区民族医院
The application value of different ultrasound methods for  measuring cervical length of women with different cervical shapes during the second trimester pregnancy
Ethnic Hospital of Guangxi Zhuang Autonomous Region,Nanning, 530001