1. The Wellcome Trust Sanger Institute, The Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SA, United Kingdom;
2. The Hospital for Tropical Diseases, Wellcome Trust Major Overseas Program, Oxford University, Clinical Research Unit, Ho Chi Minh City, Vietnam;
3. Centre for Tropical Medicine, Oxford University, Oxford OX3 7FZ, United Kingdom
4. The London School of Hygiene and Tropical Medicine, London WC1E 7HT, United Kingdom