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Funnel plot for publication bias test of CD44-related studies. Key: (A) gender; (B) age; (C) tumor location; (D) depth of invasion; (E) lymph node metastasis; (F) distant metastasis; (G) tumor, nodes, metastasis stage; (H) Lauren classification; (I) differentiation type; (J) lymphatic vessel invasion; (K) vascular invasion; and (L) overall survival.
