title: The wing sound. A new uterine measuring device.
mesh_terms: D002584:Cervix Uteri / Q000033:anatomy & histology*; D004867:Equipment Design; D005260:Female; D006176:Gynecology / Q000295:instrumentation*; D006801:Humans; D009774:Obstetrics / Q000295:instrumentation*; D011247:Pregnancy; D002581:Uterine Cervical Incompetence / Q000175:diagnosis*; D014599:Uterus / Q000033:anatomy & histology*