In its 2007 clinical management guidelines ACOG recommended offering prenatal screening and invasive diagnostic testing for fetal aneuploidy to all pregnant women before 20 weeks of gestatio..查看文章
Sonography cannot be used to diagnose or exclude aneuploidy. It provides a noninvasive means by which to adjust the a priori risk on the basis of a variety of sonographic features. Although..查看文章
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