1. School of Primary care, Population sciences, and Medical education (PPM), Faculty of Medicine, University of Southampton, Southampton, UK
2. Chronic Diseases Initiative for Africa (CDIA), Department of Medicine, University of Cape Town, South Africa
3. Department of Public Health, Vrije Universiteit Brussels, Brussel, Belgium
4. Department of Social Statistics and Demography, Faculty of Social Sciences, University of Southampton, Southampton, UK
5. Africa Health Research Institute, KwaZulu-Natal, South Africa