1. Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
2. Centre for Tropical Medicine, Churchill Hospital, University of Oxford, Oxford, United Kingdom
3. National Institute for Medical Research, Tanga Medical Research Centre, Tanga, Tanzania
4. National Institute for Medical Research, Amani Centre, Tanga, Tanzania
5. London School of Tropical Medicine and Hygiene, London, United Kingdom
6. Menzies School of Health Research, Casuarina, Northern Territory, Australia