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Begger’s funnel plot of publication bias on the pooled diagnostic odds ratio of (A) OPN, (B) AFP, and (C) OPN+AFP for diagnosing hepatocellular carcinoma.
Note: No publication bias was detected for this meta-analysis (Deeks’ test P=0.411 for AFP, P=0.565 for OPN, P=0.149 for OPN+AFP).
Abbreviations: AFP, alpha-fetoprotein; ESS, effective sample size; OPN, osteopontin; sqrt, square root.
