Oral contraceptives, pregnancy, and endogenous oestrogen in gall stone diseaseBr Med J (Clin Res Ed) 1984; 289 doi: https://doi.org/10.1136/bmj.289.6439.252 (Published 28 July 1984) Cite this as: Br Med J (Clin Res Ed) 1984;289:252
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