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. 2016 Nov 11;16:877. doi: 10.1186/s12885-016-2940-7

Fig. 1.

Fig. 1

Preferred Reporting Items for Systematic Reviews and Meta-Analyses flow diagram for literature retrieval. ESCC, esophageal squamous cell carcinoma; mTOR, mammalian target of rapamycin; p-mTOR, phosphorylated mammalian target of rapamycin