Combs, C Andrew Vaginal progesterone or cerclage to prevent recurrent preterm birth? [electronic resource] - American journal of obstetrics and gynecology Jan 2013 - 1-2 p. digital Publication Type: Editorial ISSN: 1097-6868 Standard No.: 10.1016/j.ajog.2012.08.031 doi Subjects--Topical Terms: Cerclage, CervicalFemaleHumansPregnancyPremature Birth--prevention & controlProgesterone--administration & dosageSecondary Prevention