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. 2021 Sep 30;23(9):e31122. doi: 10.2196/31122

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©Junghwan Lee, Jae Hyun Kim, Cong Liu, George Hripcsak, Karthik Natarajan, Casey Ta, Chunhua Weng. Originally published in the Journal of Medical Internet Research (https://www.jmir.org), 30.09.2021.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on https://www.jmir.org/, as well as this copyright and license information must be included.

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Condition concept prevalence in (A) age and (B) sex sub-cohorts of the COVID-19 cohort. The full COVID-19 cohort indicates original COVID-19 cohort without stratification.