title: Screening for fetal malformations by sonar prior to week 20 of pregnancy.
mesh_terms: D000013:Congenital Abnormalities / Q000175:diagnosis* / Q000196:embryology; D005260:Female; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods*; D014463:Ultrasonography