Use of sonographic markers to determine the risk of Down syndrome in second-trimester fetuses.
Benacerraf
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BR
D004314:Down Syndrome / Q000000981:diagnostic imaging* / Q000235:genetics; D005260:Female; D006801:Humans; D007085:Ilium / Q000002:abnormalities* / Q000000981:diagnostic imaging*; D007621:Karyotyping; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D016216:Ultrasonography, Prenatal