Fig. 4From: Clinical significance of matrix metalloproteinase-9 expression in papillary thyroid carcinoma: a meta-analysisBegg funnel plot and Egger funnel plot in the meta-analysis of PTC. A Begg funnel plot of the LNM in the PTC meta-analysis. B Egger funnel plot of the LNM in the PTC meta-analysisBack to article page