title: Ultrasonic placental ageing.
mesh_terms: D002113:Calcification, Physiologic; D002823:Chorion / Q000033:anatomy & histology; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007236:Infant, Small for Gestational Age; D010920:Placenta / Q000033:anatomy & histology* / Q000502:physiology; D011247:Pregnancy; D014463:Ultrasonography