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Forest plots of overall survival by lymph node density. (Left) The horizontal lines correspond to the study-specific hazard ratio (HR) and 95 % confidence interval (CI), respectively. The area of the squares reflects the study-specific weight. The diamond represents the pooled results of HR and 95 % CI. (Right) The Begg test funnel plots for publication bias. Each point represents a separate study of the indicated association. The vertical line represents the mean effects size
