Screening for Down's syndrome. A large independent trial would be useful.
Reynolds
T
T
D000328:Adult; D004314:Down Syndrome / Q000175:diagnosis*; D005260:Female; D006801:Humans; D011237:Predictive Value of Tests; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods*; D016032:Randomized Controlled Trials as Topic; D016216:Ultrasonography, Prenatal