Zhao S, Zhuang Z, Ran J, Lin J, et al. The association between domestic train transportation and novel coronavirus
(2019-nCoV) outbreak in China from 2019 to 2020: A data-driven correlational
report. Travel Med Infect Dis 2020 Jan 30:101568. doi: 10.1016/j.tmaid.2020.101568.
PMID: 32006656