1. Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford , Oxford, OX3 7LG , UK
2. Action for Health Development , Battambang 021404 , Cambodia
3. Mahidol Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University , Bangkok 10400 , Thailand
4. Battambang Provincial Health Department , Battambang , Cambodia
5. Pailin Provincial Health Department , Pailin , Cambodia
6. Cambodia Oxford Medical Research Unit, Angkor Hospital for Children , Siem Reap 171202 , Cambodia
7. Harvard TH Chan School of Public Health, Harvard University , Boston, MA 02115 , USA
8. The Open University , Milton Keynes, MK7 6AA , UK
9. Oxford University Clinical Research Unit, Hospital for Tropical Diseases , 764 Vo Van Kiet, Quan 5, Ho Chi Minh City , Vietnam
10. School of Public Health, National Institute of Public Health , 80, 289 Samdach Penn Nouth St. (289), Phnom Penh , Cambodia
11. National Centre for Parasitology, Entomology and Malaria Control , 477 Betong, Khan Sen Sok, Phnom Penh , Cambodia