The outbreak of COVID-19 has currently spread to more than 217 territories (Hui et al., 2020) since December 2019 (Chang et al., 2020; Li et al., 2020; Roda et al., 2020; Wu et al., 2020). According to the latest statistics, up to May 1, 2020, there have been more than 3,389,933 confirmed cases found in more than 187 countries covering six continents (Johns Hopkins Coronavirus Resource Center, 2020). COVID-19 was officially declared by the World Health Organization (WHO) a pandemic on March 29, 2020 (WHO, 2020).
