title: Diagnostic accuracy of first-trimester free beta-HCG and pregnancy-associated plasma protein-A assays.
authors.forename: Peter
authors.initials: P
authors.lastname: Feddema
authors.forename: Leo
authors.initials: L
authors.lastname: Vankrieken
authors.forename: Filip
authors.initials: F
authors.lastname: de Pillecijn
authors.forename: A Paul
authors.initials: AP
authors.lastname: Durham
mesh_terms: D006063:Chorionic Gonadotropin / Q000097:blood*; D016001:Confidence Intervals; D005260:Female; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011266:Pregnancy-Associated Plasma Protein-A / Q000378:metabolism*; D012680:Sensitivity and Specificity
chemical_list: D006063:Chorionic Gonadotropin; D011266:Pregnancy-Associated Plasma Protein-A