${\varphi }_0$	The relative reduction in transmissibility after vs. before lockdown of Wuhan on January 23, 2020
$z_0$	The number of infections generated by the seeding zoonotic event
sCFRi	The symptomatic case-fatality risk for age group i,i = 1, ….,m
${\alpha }_i$	The relative susceptibility to infection of age group i compared to those aged 30–39 years, i = 1, … …,m
(${\mu }_D,{\alpha }_D$)	Mean and Standard deviation for the time between onset and death
(${\mu }_{SI},{\sigma }_{SI}$)	Mean and Standard deviation of the serial interval
$\epsilon$	The proportion of human to human infections that were confirmed between December 1, 2019 and January 4, 2020