title: Ultrasound biparietal diameter. Defining relationships in normal pregnancy.
mesh_terms: D001724:Birth Weight; D002508:Cephalometry / Q000379:methods*; D005260:Female; D005333:Fetus / Q000033:anatomy & histology; D005865:Gestational Age; D006801:Humans; D010294:Parietal Bone; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods; D014463:Ultrasonography