Additional file 3.

Funnel plot analysis for lymph node metastasis after excluding studies [8,64]. Black dots represent each study's effect estimate (drawn on a log scale) plotted against its standard error. The outer dashed lines represent the 95% confidence limits around the summary effect estimate, within which 95% of studies are expected to lie in the absence of both biases and heterogeneity. P-values are for the results of Egger's test to assess publication bias.

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Tan et al. BMC Medicine 2013 11:52   doi:10.1186/1741-7015-11-52