. 2020 Jul 31;99(2):118–126. doi: 10.4174/astr.2020.99.2.118
Copyright © 2020, the Korean Surgical Society
Annals of Surgical Treatment and Research is an Open Access Journal. All articles are distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Fig. 1. The process of data selection.
