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Cerclage for Short Cervix on Ultrasound in Singleton Gestations without Prior Spontaneous Preterm Birth: a Systematic Review and Meta-analysis of Trials using individual patient-level data.
Berghella V, Ciardulli A, Rust OA, To M, Otsuki K, Althuisius S, Nicolaides K, Roman A, Saccone G.
Ultrasound Obstet Gynecol 2017;50:569-577. pdf