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. 2016 Dec 28;22(48):10643–10652. doi: 10.3748/wjg.v22.i48.10643

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©The Author(s) 2016. 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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Age-group specific prevalence of any upper gastrointestinal bleeding risk factors. A: Without Helicobacter pylori (H. pylori) prevalence imputation; B: With H. pylori prevalence imputation; NSAIDs: Non-steroidal anti-inflammatory drugs.