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. 2021 May 18;106(2):1453–1475. doi: 10.1007/s11071-021-06504-1

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© The Author(s), under exclusive licence to Springer Nature B.V. 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. 1 — Number of COVID-19 confirmed cases and total deaths for the period (30 December 2019–12 April 2021) reported weekly by WHO (https://www.who.int/publications/m/item/weekly-epidemiological-update-on-covid-19---6-april-2021 (Accessed 12 April 2021))