1. Mahidol-Oxford Tropical Medicine Research Unit, Mahidol University, Bangkok, Thailand
2. Department of Microbiology and Immunology, Mahidol University, Bangkok, Thailand
3. Department of Clinical Tropical Medicine, Mahidol University, Bangkok, Thailand
4. Department of Medicine, Cambridge University, Addenbrooke's Hospital, Cambridge, United Kingdom
5. Department of Medicine, Sappasithiprasong Hospital, Ubon Ratchathani, Thailand
6. Centre for Clinical Vaccinology and Tropical Medicine, Nuffield Department of Clinical Medicine, University of Oxford, Churchill Hospital, Oxford, United Kingdom
7. Department of Tropical Hygiene, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand