1 School of Public Health and Family Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town 7925, South Africa.
2 Institute for Training and Research in Population Studies (IFORD), University of Yaoundé II, Yaoundé, Cameroon.
3 Laboratory Sciences Division/Global Health, Population and Nutrition, FHI360, Accra, Ghana.
4 African Centre for Cities, University of Cape Town, Cape Town 7925, South Africa.
5 New York Academy of Medicine, New York, NY, USA.
6 School of Public Health and Family Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town 7925, South Africa. Electronic address: tolullah.oni@uct.ac.za.