Abstract:Objective: Observational studies have shown that rheumatoid arthritis (RA) was associated with a higher risk of inflammatory bowel disease (IBD), and vice versa. However, if such associations reflect causality remains unclear. We aimed to examine the bidirectional causal associations of RA with IBD, ulcerative colitis (UC), and Crohn’s disease (CD).Method: A Bi-directional Mendelian randomization (MR) analysis and Linkage Disequilibrium Score regression (LDSC) were used to investigate the causality between RA … Show more
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