Li et al. [10]  425 confirmed cases in Wuhan as at Jan 22, 2020  1.9 (95% CI: 1.3, 3.2)  6.1 (95% CI: 3.8, 9.7)  7.7 (95% CI: 4.9, 13.0)  NA  8.7 (95% CI: 4.8, 17.0)  NA  NA