1. Oxford University Clinical Research Unit , 78 Giai Phong, Hanoi , Vietnam
2. Partnership for Health Advancement in Vietnam, Beth Israel Deaconess Medical Center , Hanoi , Vietnam
3. Vietnam National Children’s Hospital , 18/879 La Thanh, Dong Da, Hanoi , Vietnam
4. Viet Tiep Hospital , 1 Nha Thuong, Cat Dai, Le Chan, Hai Phong , Vietnam
5. Dong Thap Hospital , 144 Mai Van Khai, My Tan , Cao Lanh, Dong Thap, Vietnam
6. National Hospital for Tropical Diseases , 78 Giai Phong, Hanoi , Vietnam
7. Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford , Oxford , UK