Salivary oestriol to progesterone ratio in relation to spontaneous labourBr Med J (Clin Res Ed) 1984; 289 doi: https://doi.org/10.1136/bmj.289.6450.1005 (Published 13 October 1984) Cite this as: Br Med J (Clin Res Ed) 1984;289:1005
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