[1] Univ Oxford, Ctr Trop Med & Global Hlth, UK Ctr Trop Med & Global Hlth, Oxford, England
[2] Myanmar Oxford Clin Res Unit, Yangon, Myanmar
[3] Lao Oxford Mahosot Hosp, Wellcome Trust Res Unit, Viangchan, Laos
[4] London Sch Hyg & Trop Med, Fac Infect & Trop Dis, London, England
[5] Angkor Hosp Children, Cambodia Oxford Med Res Unit, Siem Reap, Cambodia