1 Non-Communicable Diseases Research Unit, South African Medical Research Council, 7505 Cape Town, South Africa; Department of Medicine, Groote Schuur Hospital and University of Cape Town, Cape Town, South Africa; The George Institute for Global Health, University of Sydney, Sydney, NSW, Australia. Electronic address: andre.kengne@mrc.ac.za.
2 Department of Medicine, Groote Schuur Hospital and University of Cape Town, Cape Town, South Africa.