1. School of Public Health & Family Medicine, University of Cape Town, Cape Town, South Africa.
2. Burden of Disease Research Unit, South African Medical Research Council, Cape Town, South Africa.
3. Faculty of Public Health and Policy, London School of Hygiene and Tropical Medicine, London, UK.
4. Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, UK.
5. Department of Community Medicine, UiT the Arctic University of Norway, Tromsø, Norway.