1. Centre for Health Equity, School of Population and Global Health, University of Melbourne, Victoria, Australia;
2. Mahidol Oxford Tropical Medicine Research Unit (MORU), Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand;
3. Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK;
4. The Ethox Centre, Nuffield Department of Population Health, University of Oxford, Oxford, UK;
5. Kenya Medical Research Institute (KEMRI) - Wellcome Trust Research Programme, Nairobi, Kenya;
6. Centre for Tropical Medicine and Global Health, Nuffield Department of Population Health, University of Oxford, Oxford, UK