[1] Vanderbilt Univ, Vanderbilt Inst Global Hlth, Med Ctr, 2525 West End Ave,Suite 750, Nashville, TN 37203 USA
[2] Chaoyang Dist Ctr Dis Control & Prevent, Beijing, Peoples R China
[3] Vanderbilt Univ, Med Ctr, Dept Med, Div Epidemiol, Nashville, TN USA
[4] Chinese Ctr Dis Control & Prevent China CDC, Collaborat Innovat Ctr Diag & Treatment Infect Di, State Key Lab Infect Dis Prevent & Control SKLID, Beijing, Peoples R China
[5] Beijing City Ctr Dis Control & Prevent, Beijing, Peoples R China
[6] Vanderbilt Univ, Med Ctr, Dept Pediat, Nashville, TN 37232 USA