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Funnel plot of histologically confirmed en bloc (R0) resection rate in 53 studies involving 18017 tumors in 16472 patients that underwent gastric endoscopic submucosal dissection. Each dot represents the R0 resection rate. Asymmetry in the distribution of study estimates around the center of the funnel suggests a potential publication bias. P value for egger’s test < 0.001. ES: Estimate; se (ES): Standard error of estimate.
