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. 2021 Dec 26;9(36):11220–11227. doi: 10.12998/wjcc.v9.i36.11220

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©The Author(s) 2021. 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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Ulcerative colitis disease activity index score during the first wave of the coronavirus disease 2019 pandemic as compared with the previous visit (n = 289). During the first wave of the coronavirus disease 2019 pandemic in Japan (March–April 2020), consecutive ulcerative colitis (UC) patients presenting to our clinic were enrolled in this study. Mean modified UC-disease activity index was significantly higher on the day of entry than at the previous visit. UC-DAI: Ulcerative colitis disease activity index.