Chinese provinces colour coded according to the number of cases of 2019-nCoV [4] as at 27 January 2020 2019-nCoV: Novel coronavirus. The 14 cities selected for the multi-source seeding [14] are shown with black dots: Beijing (in the province of Beijing), Changsha (Hunan), Chengdu (Sichuan), Chongqing (Chongqing), Fuzhou (Fujian), Guangzhou (Guangdong), Hangzhou (Zhe