Cerclage for short cervix on ultrasonography: meta-analysis of trials using individual patient-level data.
Berghella V, Odibo AO, To MS, Rust OA, Althuisius SM. Cerclage for short cervix on ultrasonography: meta-analysis of trials using individual patient-level data. Obstet Gynecol. 2005 Jul; 106(1):181-9.