[1] London Sch Hyg & Trop Med, London, England
[2] Nagasaki Univ, Sch Trop Med & Global Hlth, Nagasaki, Japan
[3] Mahidol Univ, Fac Publ Hlth, Bangkok, Thailand
[4] Minist Hlth, Lao Trop & Publ Hlth Inst, Viangchan, Laos
[5] Lao Oxford Mahosot Hosp Wellcome Trust Res Unit L, Viangchan, Laos
[6] Mahidol Oxford Trop Med Res Unit MORU, Bangkok, Thailand
[7] Univ Oxford, Ctr Trop Med & Global Hlth, Oxford, England
[8] Univ Queensland, Fac Med, Brisbane, Australia
[9] Angkor Hosp Children, Oxford Med Res Unit, Siem Reap, Cambodia
[10] Publ Hlth Off, Savannakhet, Laos
[11] Univ Hlth Sci, Inst Res & Educ Dev, Minist Hlth, Viangchan, Laos