[1] Chinese Ctr Dis Control & Prevent China CDC, Collaborat Innovat Ctr Diag & Treatment Infect Di, State Key Lab Infect Dis Prevent & Control, Beijing, Peoples R China
[2] York Univ, Dept Math & Stat, Ctr Dis Modelling, Lab Ind & Appl Math, Toronto, ON M3J 1P3, Canada