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Funnel plot of sensitivity and specificity of thymidine kinase. Summary graphs were created with study-specific (box) and overall (diamond) point estimates and confidence intervals (CIs) for each performance index pair using graph combine. The squares and horizontal lines correspond to the study-specific odds ratio (OR) and 95% CI, respectively. The area of the squares reflects the study-specific weight. The diamond represents the pooled OR and 95% CI.
