TY  - RPRT
TI  - Maternal postural challenge as a functional test for cervical incompetence.
AU  - G Wong
AU  - D Levine
AU  - J Ludmir
PY  - 1997
DO  - 10.7863/jum.1997.16.3.169
UR  - https://pubmed.ncbi.nlm.nih.gov/9166812/
ID  - 9166812
ER  -