Premature cervical dilatation and the McDonald cerclage.
D001724:Birth Weight; D002584:Cervix Uteri / Q000601:surgery*; D005321:Extraembryonic Membranes; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007752:Obstetric Labor, Premature / Q000517:prevention & control*; D011247:Pregnancy; D013536:Suture Techniques