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A randomized trial of cerclage versus no cerclage among patients with ultrasonographically detected second-trimester preterm dilatation of the internal os

Obstetric ImagingCerclage VersusInternal OsGynecologyMaternal HealthPregnancyPreterm BirthObstetricsSurgeryMaternal-fetal MedicineRandomized TrialPublic HealthIntrapartum UltrasoundMedicine