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. 2018 Nov 22;10:6167–6179. doi: 10.2147/CMAR.S171035

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© 2018 Sun and Zhang. This work is published and licensed by Dove Medical Press Limited

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Flow diagram of studies selection procedure.

Abbreviations: NLR, neutrophil to lymphocyte ratio; PLR, platelet to lymphocyte ratio; LMR, lymphocyte to monocyte ratio; EC, esophageal cancer; ESCC, esophageal squamous cell carcinoma.