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. 2022 Mar 18;13(3):259–266. doi: 10.5312/wjo.v13.i3.259

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©The Author(s) 2022. Published by Baishideng Publishing Group Inc. All rights reserved.

This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/Licenses/by-nc/4.0/

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Learning curve. The inaccurate injection rate is the total number of “major leakage” divided by the total number of injected cases that was recorded every 10 cases. The learning curve is represented by the dotted curve. Spearman’s rank correlation coefficient was analyzed (R²= 0.887, P < 0.001).