title: Role of second-trimester ultrasound in screening for Down syndrome.
authors: Department of Obstetrics and Gynecology, Columbia University Medical Center, New York, NY, USA. hsc2121@columbia.edu
authors: H
authors: H
authors: Cuckle
authors: R
authors: R
authors: Maymon
mesh_terms: D015415:Biomarkers / Q000097:blood; D004314:Down Syndrome / Q000097:blood / Q000175:diagnosis / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D048208:Nuchal Translucency Measurement; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011262:Pregnancy Trimester, Second; D011296:Prenatal Diagnosis / Q000379:methods*; D012306:Risk; D013997:Time Factors; D016216:Ultrasonography, Prenatal
chemical_list: D015415:Biomarkers