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Begger’s funnel plot of publication biases on the associations of interleukin-17/F polymorphisms and serum interleukin-17 levels with susceptibility to ulcerative colitis. Each point represents a separate study for the indicated association. Log (OR) refers to the natural logarithm of the odds ratio; Horizontal line indicates the mean magnitude of the effect. IL-17: Interleukin-17.
