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Obstetric ultrasonography - Wikipedia, the free encyclopedia
瀏覽：1446
日期：2024-04-24
The sex of the fetus may be discerned by ultrasound as early as 11 weeks gestation. The accuracy is relatively imprecise when attempted early. After 13 weeks gestation, a high accuracy of between 99% to 100% is possible if there is no malformed external ....看更多
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