Research Article
Increased saliva oestriol to progesterone ratio before preterm delivery: a possible predictor for preterm labor?
Br Med J (Clin Res Ed) 1987; 294 doi: https://doi.org/10.1136/bmj.294.6567.270 (Published 31 January 1987) Cite this as: Br Med J (Clin Res Ed) 1987;294:270
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