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The methodological quality of each study and the risk of bias of randomized and non-randomized studies were rated using the Cochrane Collaboration tool [16] and Newcastle-Ottawa Scale [17], respectively. We used Review Manager 5.3 (The Nordic Cochrane Centre, The Cochrane Collaboration, Copenhagen, Denmark) software package to construct comparison plots.
Copyright and License information: ©2020 Korean Society of Gastrointestinal Endoscopy
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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