TY  - RPRT
TI  - Cervical incompetence.
AU  - B Shortle
AU  - R Jewelewicz
PY  - 1989
DO  - 10.1016/s0015-0282(16)60839-7
UR  - https://pubmed.ncbi.nlm.nih.gov/2666173/
ID  - 2666173
ER  -