1. Department of Medical Research, Yangon, Myanmar;
2. Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom
3. Centre for Tropical Medicine and Global Health, University of Oxford, Oxford, United Kingdom;
4. Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit, Microbiology Laboratory, Mahosot Hospital, Vientiane, Lao PDR;