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. 2020 Jan 14;26(2):199–218. doi: 10.3748/wjg.v26.i2.199

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©The Author(s) 2020. Published by Baishideng Publishing Group Inc. All rights reserved.

This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (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.

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Changes in the Shannon index and Richness in patients of the two groups before and after treatment. A: Changes in the Shannon index in patients of the two groups before and after treatment (no significant decrease); B: Changes in the Richness in patients of the two groups before and after treatment: (no significant decrease).