[1] Oxford Univ Clin Res Unit, Ctr Trop Med, Ho Chi Minh City, Vietnam
[2] Univ Oxford, Ctr Trop Med & Global Hlth, Nuffield Dept Med, Oxford, England
[3] Univ Cape Town, Div Neurosurg, Cape Town, South Africa
[4] Univ Cape Town, Inst Neurosci, Cape Town, South Africa
[5] Univ Indonesia, Fac Med, Cipto Mangunkusumo Hosp, Jakarta, Indonesia
[6] Hosp Trop Dis, Ho Chi Minh City, Vietnam