The coronavirus disease 2019 (COVID-19) outbreak continues to spread rapidly around the world. By the end of 2020, there have been nearly 80 million confirmed cases and over 1.7 million deaths associated with COVID-19 globally (https://www.who.int/emergencies/diseases/novel-coronavirus-2019), with an estimated mortality rate of 0.03%–40% (Wiersinga et al., 2020). Noticeably, the COVID-19 is predicted to threaten millions of people throughout the world in the coming months and years.