title: Response to: Wald, N.J., Hackshaw, A.K. (1997). Combining ultrasound and biochemistry in first-trimester screening for Down's syndrome, Prenat. Diagn., 17, 821-829.
authors.forename: T M
authors.initials: TM
authors.lastname: Reynolds
authors.forename: F
authors.initials: F
authors.lastname: Dunstan
authors.forename: B
authors.initials: B
authors.lastname: Nix
authors.forename: K
authors.initials: K
authors.lastname: Williams
authors.forename: J
authors.initials: J
authors.lastname: Crossley
authors.forename: S
authors.initials: S
authors.lastname: Holding
authors.forename: D
authors.initials: D
authors.lastname: Krantz
authors.forename: D
authors.initials: D
authors.lastname: Wright
authors.forename: I
authors.initials: I
authors.lastname: Bray
authors.forename: K
authors.initials: K
authors.lastname: Spencer
mesh_terms: D018997:Chorionic Gonadotropin, beta Subunit, Human / Q000097:blood; D004314:Down Syndrome / Q000175:diagnosis*; D005260:Female; D006801:Humans; D009333:Neck / Q000000981:diagnostic imaging; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011266:Pregnancy-Associated Plasma Protein-A / Q000032:analysis; D011296:Prenatal Diagnosis / Q000379:methods*; D014463:Ultrasonography
chemical_list: D018997:Chorionic Gonadotropin, beta Subunit, Human; D011266:Pregnancy-Associated Plasma Protein-A