1. School of Public Health, University of the Western Cape , Bellville, Cape Town 7535, South Africa
2. Non-Communicable Diseases Research Unit, South African Medical Research Council , Cape Town 7505, South Africa
3. Chronic Disease Initiative for Africa, University of Cape Town , Cape Town 7700, South Africa
4. Department of Public Health, Vrije Universiteit Brussel , Brussels, Belgium
5. Menzies Centre for Health Policy and Economics, University of Sydney , Camperdown, NSW 2006, Australia