1 Burden of Disease Research Unit, South African Medical Research Council, Tygerberg 7505, South Africa; Department of Family Medicine and Public Health, University of Cape Town, Rondebosch, South Africa. Electronic address: debbie.bradshaw@mrc.ac.za.
2 Centre for Actuarial Research, University of Cape Town, Rondebosch, South Africa.
3 Burden of Disease Research Unit, South African Medical Research Council, Tygerberg 7505, South Africa.
4 Centre for Tuberculosis, National Institute for Communicable Diseases, Division of the National Health Laboratory Service, Johannesburg, South Africa; School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa.