1. Pregnancy outcomes following placement of elective, urgent and emergent cerclage;Nelson;J Matern Fetal Neonatal Med,2009
2. Royal College of Obstetricians and Gynaecologists Cervical Cerclage: Green-top Guideline No. 60 http://www.rcog.org.uk/files/rcog-corp/GTG60cervicalcerclage.pdf
3. Elective and emergency cervical cerclage and immediate pregnancy outcomes: a retrospective observational study;Liddiard;JRSM Short Rep,2011
4. Cervical incompetence prevention randomized cerclage trial. Cervical incompetence prevention randomized cerclage trial: emergency cerclage with bed rest versus bed rest alone;Althuisius;Am J Obstet Gynecol,2003
5. Emergency cerclage compared with bed rest for advanced cervical dilatation in pregnancy;Olatunbosun;Int Surg,1995