Quantifying the association between domestic travel and the exportation of novel coronavirus (2019-nCoV) cases from Wuhan, China in 2020: a correlational analysis

In the end of 2019, a novel coronavirus (2019-nCoV) emerged in China and was causing a serious outbreak of acute respiratory illness. Wuhan locates in the centre of mainland China with a population of 14 million and is very conveniently connected to other parts of China through airlines and high-speed rails. As of 31 January 2020 (5:00 p.m., GMT + 8), there were 9809 confirmed 2019-nCoV cases in mainland China, including 213 deaths and 180 discharges. 3 , 4 Cases infected in Wuhan were also detected in many foreign countries or