title: Ultrasound: a new approach to the evaluation of cervical ripening.
authors.affiliation: Department of Obstetrics and Gynecology, University of Michigan, Ann Arbor 48109.
authors.forename: H F
authors.initials: HF
authors.lastname: Andersen
authors.forename: R
authors.initials: R
authors.lastname: Ansbacher
mesh_terms: D000005:Abdomen; D002584:Cervix Uteri / Q000000981:diagnostic imaging* / Q000502:physiology; D005260:Female; D006801:Humans; D007752:Obstetric Labor, Premature / Q000503:physiopathology; D010808:Physical Examination; D011247:Pregnancy; D012307:Risk Factors; D014463:Ultrasonography; D002581:Uterine Cervical Incompetence / Q000000981:diagnostic imaging; D014621:Vagina