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. 2019 Aug 22;11:7967–7979. doi: 10.2147/CMAR.S205841

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© 2019 Wang et al.

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Funnel plot analysis of potential publication bias (Begg’s test). (A) TNM. (B) LNM. (C) OS.

Abbreviations: TNM, tumor-node-metastasis; LNM, lymph node metastasis; OS, overall survival.