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. 2021 Apr 8;4(3):160–168. doi: 10.1007/s42058-021-00061-7

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© The Author(s), under exclusive licence to Springer Nature Singapore Pte Ltd. 2021

This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.

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Fig. 2 — Timeline of the percentage of total infection. Figure 1a compares the dynamic change between severe group and common group. Figure 1b illustrates the percentage of total infection in patients diagnosed as common but aggravated to severe during hospitalization