ACOG committee opinion. First-trimester screening for fetal anomalies with nuchal translucency. Number 223, October 1999. Committee on Genetics. American College of Obstetricians and Gynecologists.
D002869:Chromosome Aberrations / Q000175:diagnosis*; D025063:Chromosome Disorders; D005260:Female; D005333:Fetus / Q000002:abnormalities*; D006801:Humans; D008403:Mass Screening; D009333:Neck / Q000000981:diagnostic imaging* / Q000196:embryology; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D014463:Ultrasonography