COVID-19 international outbreak and the need for a suitable estimation model: A second-order polynomial equation with constant coefficients based on imported infected cases seems inadequate
<正>COVID-19 due to infections with the 2019 novel coronavirus(SARS-CoV-2) was first reported in Wuhan, Hubei Province, China in December 2019. Up to 2 March 2020, it has already spread to more than 55 countries, infected more than 85 000 individuals, and yielded to about 3 000 death cases[1]. Due to the vigorous outbreak of COVID-19, it has become a global concern. Further management and controlling of this worldwide threat inevitably