TY  - RPRT
TI  - The preterm cervix and preterm labor: relative risks, predictive values, and change over time.
AU  - T M Stubbs
AU  - J P Van Dorsten
AU  - M C Miller
PY  - 1986
DO  - 10.1016/s0002-9378(86)80031-x
UR  - https://pubmed.ncbi.nlm.nih.gov/3766637/
ID  - 3766637
ER  -