Trends in prenatal diagnosis of Down's syndrome.
Spencer
K
K
D004314:Down Syndrome / Q000175:diagnosis*; D005260:Female; D005315:Fetal Diseases / Q000175:diagnosis*; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000639:trends*; D016216:Ultrasonography, Prenatal