1. Centre for Tropical Medicine and Global Health, Churchill Hospital, University of Oxford, Oxford, United Kingdom;
2. Lao Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Microbiology Laboratory, Mahosot Hospital, Vientiane, Lao PDR;
3. Scottish Trace Element and Micronutrient Diagnostic and Research Laboratory, Glasgow Royal Infirmary, Glasgow, United Kingdom;
4. Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand;
5. MRC Elsie Widdowson Laboratory, Cambridge, United Kingdom;
6. Institute of Research and Education Development, University of Health Sciences, Ministry of Health, Vientiane, Lao PDR