title: Cervical Pessary and Preterm Singleton Birth.
authors: Kypros Nicolaides
authors: KN
authors: Nicolaides
mesh_terms: D002584:Cervix Uteri; D005260:Female; D006801:Humans; D010570:Pessaries; D011247:Pregnancy; D047928:Premature Birth / Q000517:prevention & control*