title: Low second-trimester maternal serum human chorionic gonadotrophin in a trisomy 9 pregnancy.
authors.forename: Y H
authors.initials: YH
authors.lastname: Lam
authors.forename: C P
authors.initials: CP
authors.lastname: Lee
authors.forename: M H
authors.initials: MH
authors.lastname: Tang
mesh_terms: D000015:Abnormalities, Multiple / Q000235:genetics; D000328:Adult; D000649:Amniocentesis; D006063:Chorionic Gonadotropin / Q000097:blood*; D002899:Chromosomes, Human, Pair 9; D005260:Female; D006801:Humans; D011247:Pregnancy; D014314:Trisomy
chemical_list: D006063:Chorionic Gonadotropin