[1] Farr Inst Hlth Informat, Dept UCL Infect Dis Informat, London, England
[2] UCL, Dept Div Infect & Immun, London, England
[3] UCL, Dept Inst Epidemiol & Hlth Care, London, England
[4] Univ Indonesia, Fac Publ Hlth, Dept Epidemiol, Depok, Indonesia