title: Down's syndrome screening in twins.
authors.forename: H
authors.initials: H
authors.lastname: Cuckle
mesh_terms: D015415:Biomarkers; D006063:Chorionic Gonadotropin / Q000032:analysis; D004200:Diseases in Twins; D004314:Down Syndrome / Q000175:diagnosis*; D004964:Estriol / Q000032:analysis; D005260:Female; D006801:Humans; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D011296:Prenatal Diagnosis; D015995:Prevalence; D012307:Risk Factors; D000509:alpha-Fetoproteins / Q000032:analysis
chemical_list: D015415:Biomarkers; D006063:Chorionic Gonadotropin; D000509:alpha-Fetoproteins; D004964:Estriol