title: Cervical pessary does not prevent preterm births, study shows.
authors.affiliation: London.
authors.forename: Susan
authors.initials: S
authors.lastname: Mayor
mesh_terms: D002584:Cervix Uteri; D005260:Female; D006801:Humans; D010570:Pessaries; D011247:Pregnancy; D047928:Premature Birth / Q000517:prevention & control*