1. Medical department, Sunpasitthiprasong Hospital, Ubon Ratchathani, Thailand;
2. Microbiological department, Sunpasitthiprasong Hospital, Ubon Ratchathani, Thailand;
3. Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand;
4. Nuffield Department of Medicine, Centre for Tropical Medicine and Global Health, University of Oxford, Oxford, United Kingdom;
5. Department of Tropical Hygiene, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand