title: Hormonal screening for detection of twin pregnancies.
mesh_terms: D006063:Chorionic Gonadotropin / Q000097:blood*; D005260:Female; D006801:Humans; D010926:Placental Hormones / Q000097:blood*; D011247:Pregnancy; D011272:Pregnancy, Multiple; D011296:Prenatal Diagnosis; D014427:Twins
chemical_list: D006063:Chorionic Gonadotropin; D010926:Placental Hormones