title: Vaginal progesterone or cerclage to prevent recurrent preterm birth?
authors.forename: C Andrew
authors.initials: CA
authors.lastname: Combs
mesh_terms: D023802:Cerclage, Cervical; D005260:Female; D006801:Humans; D011247:Pregnancy; D047928:Premature Birth / Q000517:prevention & control*; D011374:Progesterone / Q000008:administration & dosage / Q000627:therapeutic use*; D055502:Secondary Prevention
chemical_list: D011374:Progesterone