Chronic inflammatory bowel disease, cigarette smoking and use of oral contraceptives.Br Med J (Clin Res Ed) 1986; 292 doi: https://doi.org/10.1136/bmj.292.6533.1464-a (Published 31 May 1986) Cite this as: Br Med J (Clin Res Ed) 1986;292:1464
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