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In December 2019, an outbreak of respiratory infectious disease (COVID-19) due to a novel coronavirus (at the time officially named SARS-CoV-2) emerged in the city of Wuhan in the Chinese province of Hubei. The outbreak was declared a Public Health Emergency of International Concern on 30 January 2020, and a pandemic on 12 March 2020 (https://www.who.int/emergencies/ diseases/novel-coronavirus-2019/events-as-they-happen). As of 20 May 2020, this pandemic has affected 213 countries and territories around the world with 4 989 546 confirmed cases and 324 974 deaths (https://www.worldometers.info/coronavirus/).
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Hoang et al. (2020) studied this question.
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