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. 2018 Aug 3;6(8):E998–E1007. doi: 10.1055/a-0579-9050

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This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License, which permits unrestricted reproduction and distribution, for non-commercial purposes only; and use and reproduction, but not distribution, of adapted material for non-commercial purposes only, provided the original work is properly cited.

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Fig. 7 — Funnel plots for main (left) and secondary outcomes (right). The shapes of the left funnel plot revealed a degree of asymmetry, which indicates publication bias may exist in main outcomes. Each point represents a separate study for the association of the endoscopic resection techniques with outcomes. OR: odds ratio; Log (OR): natural logarithm of OR; SE: standard error; SE (Log [OR]): standard error of Log (OR).