title: Biparietal diameter measurements: is there an optimal level for these?
authors.forename: P M
authors.initials: PM
authors.lastname: Mok
authors.forename: J M
authors.initials: JM
authors.lastname: Mitchell
authors.forename: R M
authors.initials: RM
authors.lastname: Whitlock
authors.forename: M
authors.initials: M
authors.lastname: Vedder
mesh_terms: D001921:Brain / Q000033:anatomy & histology*; D002508:Cephalometry; D005333:Fetus / Q000033:anatomy & histology*; D005865:Gestational Age; D006801:Humans; D014463:Ultrasonography