1 Division of Public Health Medicine, School of Public Health and Family Medicine, University of Cape Town, Cape Town, South Africa; Medical Research Council Epidemiology Unit, University of Cambridge, CB2 0QQ Cambridge, UK. Electronic address: tolullah.oni@mrc-epid.cam.ac.uk.
2 Institute of Cardiovascular Science, Division of Medicine, University College London, London, UK.
3 School of Public Health, University of the Witwatersrand, Johannesburg, South Africa.
4 Department of Social and Behavioral Sciences, School of Public Health, College of Health Sciences, University of Ghana, Legon, Ghana.
5 Department of Health Policy, Systems & Public Health, Tropical Institute of Community Health & Development (TICH), Kisumu, Kenya.
6 Department of Health Promotion & Education, Faculty of Public Health, College of Medicine, University of Ibadan, Ibadan, Nigeria.
7 School for Policy Studies, University of Bristol, Bristol, UK.
8 Division of Public Health Medicine, School of Public Health and Family Medicine, University of Cape Town, Cape Town, South Africa.