Obstetric anal sphincter injury by maternal origin and length of residence: a nationwide cohort study.
I K SørbyeSukhjeet BainsS VangenJ SundbyB LindskogK M OwePublished in: BJOG : an international journal of obstetrics and gynaecology (2021)
Anal sphincter injury during birth is more common among Asian and Sub-Saharan migrants and particularly among recent arrivals.