TY  - RPRT
TI  - ACOG practice bulletin. Cervical insufficiency.
AU  - American College of Obstetrics and Gynecologist
PY  - 2004
DO  - 10.1016/s0020-7292(04)00035-9
UR  - https://pubmed.ncbi.nlm.nih.gov/15124633/
ID  - 15124633
ER  -