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. 2019 Nov 14;25(42):6354–6364. doi: 10.3748/wjg.v25.i42.6354

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©The Author(s) 2019. 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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Comparison of cumulative incidence of inflammatory bowel disease in patients with chronic obstructive pulmonary disease according to the severity of chronic obstructive pulmonary disease. IBD: Inflammatory bowel disease; COPD: Chronic obstructive pulmonary disease.