1. Centre for Tropical Medicine and Global Health, University of Oxford, Oxford, OX3 7LG, UK
2. Institute for Applied Research, Birmingham University, Birmingham, B15 2TT, UK
3. Centre for Medical Education, Health Sciences Education, Queen Mary University of London, London, E1 4NS, UK
4. MoPoTsyo Patient Information Center, Stung Meanchey Commune, 12352 Phnom Penh, Cambodia
5. AGE Research Group, NIHR Newcastle Biomedical Research Centre, Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University and Newcastle Upon Tyne Hospitals NHS Trust
6. Centre for Global Surgery, Department of Global Health, Stellenbosch University, Cape Town,South Africa
7. Medical Research Council/Wits University Rural Public Health and Health Transitions Research Unit, Faculty of Health Sciences, School of Public Health, University of the Witwatersrand, Johannesburg, South Africa