摘要
To editor:Cervical insufficiency,or cervical incompetence,is characterized by painless cervix dilatation during the second trimester without contractions.1 It is found in 0.1%–1%of all pregnancies and in up to 8.0%of women with recurrent second-trimester miscarriages.2–4 Cervical insufficiency is associated with premature birth,which is a leading cause of neonatal and perinatal mortality and morbidity.
基金
This work was supported by the National Key Research and Development Program of China(no.2021YFC2700700).
