The coronavirus disease 2019 (COVID-19) broke out in Wuhan, China, quickly sweeping the world, infecting more than 29 million people, and killing 937,391 by Sep 17th, 2020, according to reports from the WHO (https://www.who.int/zh/emergencies/diseases/novel-coronavirus-2019). To lower the risk of disease transmission, most countries took active and effective measures. The national security strategy for COVID-19 in China shifted to so-called wartime control measures from Jan 23rd to April 8th, putting cities on lockdown and affecting an estimated 760 million individuals [1].
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