1. Wellcome Trust Major Overseas Programme, Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Vo Van Kiet, District 5, Ho Chi Minh City, Vietnam
2. Quadram Institute Bioscience, Norwich Research Park, Norwich, UK
3. Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, University of Melbourne, Melbourne, Australia
4. Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
5. Hospital for Tropical Diseases, Vo Van Kiet, District 5, Ho Chi Minh City, Vietnam
6. Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK
7. Department of Medicine, University of Cambridge, Cambridge, UK