Is smoking an indirect risk factor for the development of ulcerative colitis? An age- and sex-matched case-control study.

Abstract

BACKGROUND It has been suggested that smoking protects against the development of ulcerative colitis (UC). Evidence is mainly driven from the way data from a multitude of case-control studies have been interpreted. METHODS An age- and sex-matched case-control study was conducted to further assess the association between history of smoking, past surgery… (More)

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