title: Accuracy of second trimester fetal head circumference and biparietal diameter for predicting the time of spontaneous birth.
authors.forename: Håkon K
authors.initials: HK
authors.lastname: Gjessing
authors.forename: Per
authors.initials: P
authors.lastname: Grøttum
mesh_terms: D005260:Female; D005333:Fetus / Q000033:anatomy & histology*; D005865:Gestational Age; D006257:Head / Q000000981:diagnostic imaging / Q000196:embryology*; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D047929:Term Birth; D016216:Ultrasonography, Prenatal