title: Use of sonographic markers to determine the risk of Down syndrome in second-trimester fetuses.
authors.forename: B R
authors.initials: BR
authors.lastname: Benacerraf
mesh_terms: 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