title: [Ultrasonography in the surveillance of the uterine cervix during pregnancy].
authors.forename: H
authors.initials: H
authors.lastname: Yu
authors.forename: W
authors.initials: W
authors.lastname: Li
mesh_terms: D002584:Cervix Uteri / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D007752:Obstetric Labor, Premature / Q000000981:diagnostic imaging*; D011247:Pregnancy; D014463:Ultrasonography; D002581:Uterine Cervical Incompetence / Q000000981:diagnostic imaging*