title: Sonographic assessment of the incompetent cervix during pregnancy.
authors.affiliation: Department of Obstetrics and Gynecology, University of Pennsylvania School of Medicine, Philadelphia 19104-4283, USA.
authors.forename: S J
authors.initials: SJ
authors.lastname: Marder
authors.forename: M
authors.initials: M
authors.lastname: Jackson
mesh_terms: D002584:Cervix Uteri / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D011247:Pregnancy; D016216:Ultrasonography, Prenatal; D002581:Uterine Cervical Incompetence / Q000000981:diagnostic imaging* / Q000628:therapy