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. 2021 Jul 27;4:117. doi: 10.1038/s41746-021-00484-7

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — A Relative timeline for each of the patients in the study, divided into the pre-COVID phase (1 year prior to the first positive PCR test), and the SARS-CoV-2 positive phase (90 days following the first positive PCR test). B Clinical notes from 1803 hospitalized COVID and non-COVID patients are analyzed with Bidirectional Encoder Representations from Transformers (BERT) model to extract the presence or absence of comorbidities and complications. C Distribution of pre-existing conditions in the first year before the first positive PCR test. D Distribution of complications at early (0–31 days) and late time points (31–60 days and 61–90 days) after the first positive PCR test.