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Publication bias in the included trials. Egger’s linear regression test for detecting publication bias in terms of (A) ASAS 20, (B) ASAS 50 and (C) Bath ankylosing spondylitis disease activity index 50. ‘○’ is a size graph symbol for the weight of each included study. The distance between two diamonds on the second vertical bar on the left represents the 95% confidence interval for the intercept. ASAS, assessment in ankylosing spondylitis.
