Risk of preterm birth by height of cerclage as a percentage of cervical length.
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资源简介：
The relative risk of preterm birth before 34 and 37 weeks of gestation is shown in women with cerclages placed in the distal half (represented as < 50% height) of the cervix relative to those with cerclages placed in the proximal half (represented as > 50%).
创建时间：
2017-06-02
