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Forest plots obtained by random effects model analysis, performed to compare the (A) disease duration of IBD, (B) efficacy of corticosteroid therapy, (C) colectomy rate, (D) incidence of severe IBD, (E) incidence of pancolitis and (F) incidence of life-sided IBD, between the CMV-positive and CMV-negative patients. IBD, inflammatory bowel disease; CMV, cytomegalovirus; SMD, standardized mean difference; RR, relative risk; 95% CI, 95% confidence interval.
