1. Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand;
2. Chiangrai Prachanukroh Hospital, Chiang Rai, Thailand;
3. Faculty of Medicine, University of Basel, Basel, Switzerland;
4. Department of Medicine, Swiss Tropical and Public Health Institute, Basel, Switzerland;
5. Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Churchill Hospital, Oxford, United Kingdom;
6. Department of Preventive Medicine and Biostatistics, Uniformed Services University of the Health Sciences, Bethesda, Maryland
7. Viral and Rickettsial Diseases Department, Naval Medical Research Center, Silver Spring, Maryland;