Coronavirus disease 2019 (COVID-19), formerly known as severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and 2019 novel coronavirus (2019-nCoV), was first identified in December 2019 in Wuhan City in central China [1,2]. From the end of December 2019, COVID-19 began to spread rapidly throughout Hubei Province and other areas in China [2,3]. As of February 18th, 2020, more than 72,500 people had been diagnosed with COVID-19 in China, and more than 1,800 patients had died from this new viral infection, mainly from pneumonia and other respiratory complications [3].