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. 2021 Jan 28;13(1):1–18. doi: 10.4329/wjr.v13.i1.1

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©The Author(s) 2021. Published by Baishideng Publishing Group Inc. All rights reserved.

This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (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. See: http://creativecommons.org/Licenses/by-nc/4.0/

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Percentage of selected underlying medical conditions under the coronavirus disease-2019-associated hospitalization surveillance network hospitalization data (by September 5, 2020; https://gis.cdc.gov/grasp/COVIDNet/COVID19_5.html).