Causal Link between Inflammatory Bowel Disease and Fistula: Evidence from Mendelian Randomization Study

Abstract excerpt

Background: Previous observational studies have found that fistulas are common in Crohn’s disease (CD) and less common in ulcerative colitis (UC). However, some patients have a fistula before diagnosis. Based on retrospective analysis, it was not possible to determine whether there was a bi-directional causal relationship between inflammatory bowel disease (IBD) and fistulas. Methods: Data were extracted from the...

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