Antenatal screening for Down's syndrome.
Smith
L
L
D004314:Down Syndrome / Q000175:diagnosis / Q000517:prevention & control*; D005260:Female; D006801:Humans; D008403:Mass Screening / Q000379:methods*; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods*; D012307:Risk Factors