title: Poor design in cerclage studies.
authors.forename: James H
authors.initials: JH
authors.lastname: Harger
mesh_terms: D023802:Cerclage, Cervical; D005260:Female; D006801:Humans; D007752:Obstetric Labor, Premature / Q000517:prevention & control*; D011247:Pregnancy; D012107:Research Design