title: Re: First-trimester combined screening for trisomy 21 with different combinations of placental growth factor, free β-human chorionic gonadotropin and pregnancy-associated plasma protein-A. K. O. Kagan, M. Hoopmann, H. Abele, R. Alkier and K. Lüthgens. Ultrasound Obstet Gynecol  2012; 40: 530-535.
authors.affiliation: Fetal Medicine Unit-SAMID, Department of Obstetrics and Gynaecology, Hospital Universitario 12 de Octubre, Universidad Complutense de Madrid, Avda, Córdoba s/n., Madrid, 28041, Spain. agalindo.hdoc@salud.madrid.org
authors.forename: A
authors.initials: A
authors.lastname: Galindo
authors.forename: I
authors.initials: I
authors.lastname: Herraiz
mesh_terms: D004314:Down Syndrome / Q000097:blood*; D005260:Female; D006801:Humans; D000072483:Placenta Growth Factor; D011247:Pregnancy; D011257:Pregnancy Proteins / Q000097:blood*; D011266:Pregnancy-Associated Plasma Protein-A / Q000378:metabolism*
chemical_list: C000608036:PGF protein, human; D011257:Pregnancy Proteins; D000072483:Placenta Growth Factor; D011266:Pregnancy-Associated Plasma Protein-A