title: Crown rump length: a comparison of real time scanning and conventional compound scanning. The interindividual measuring variation between two operators.
mesh_terms: D005260:Female; D005333:Fetus / Q000033:anatomy & histology* / Q000502:physiology; D005865:Gestational Age; D006128:Growth; D006801:Humans; D011247:Pregnancy; D014463:Ultrasonography