Comparison of the efficacy of different treatments after non-curative endoscopic resection of superficial esophageal carcinoma: a meta-analysis.

Publication bias Assessment of publication bias in the comparison of observation versus adjuvant treatment involved visual inspection of the funnel plot, which indicated asymmetry ( Figure 6 ), and Egger’s regression test, which showed a borderline significant result ( t = 2.38, P = 0.055).

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