title: First trimester markers of trisomy 21 and the influence of maternal cigarette smoking status.
authors.forename: K
authors.initials: K
authors.lastname: Spencer
authors.forename: C Y
authors.initials: CY
authors.lastname: Ong
authors.forename: A W
authors.initials: AW
authors.lastname: Liao
authors.forename: D
authors.initials: D
authors.lastname: Papademetriou
authors.forename: K H
authors.initials: KH
authors.lastname: Nicolaides
mesh_terms: D000328:Adult; D015415:Biomarkers / Q000097:blood*; D016022:Case-Control Studies; D018997:Chorionic Gonadotropin, beta Subunit, Human / Q000097:blood*; D004314:Down Syndrome / Q000175:diagnosis*; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D011237:Predictive Value of Tests; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011266:Pregnancy-Associated Plasma Protein-A / Q000378:metabolism; D011296:Prenatal Diagnosis; D012907:Smoking; D016216:Ultrasonography, Prenatal
chemical_list: D015415:Biomarkers; D018997:Chorionic Gonadotropin, beta Subunit, Human; D011266:Pregnancy-Associated Plasma Protein-A