1. Martin JA, Hamilton BE, Osterman MJK, Driscoll AK. Births: Final Data for 2019. National health statistics reports; vol. 70, no.2 Hyattsville, MD: National Center for Health Statistics. 2022. Available form https://stacks.cdc.gov/view/cdc/100472.
2. NHS Digital. NHS Maternity Statistics 2016-2017. Available from: https://files.digital.nhs.uk/pdf/l/1/hosp-epis-stat-mat-repo-2016-17.pdf.
3. Cervical ripening;Riskin-Mashiah;Obstet Gynecol Clin North Am,1999
4. de Vaan MD, Ten Eikelder ML, Jozwiak M, et al. Mechanical methods for induction of labor. Cochrane Database Syst Rev 2019;10(10):CD001233.
5. Hoe wordt in Nederland ingeleid bij een onrijpe cervix?;Reijers;Ned Tijdschr Obstet Gynaecol,2009