[1] Stellenbosch University,Centre for Global Surgery, Department of Global Health, Faculty of Medicine and Health Sciences
[2] Stellenbosch University,Division of Health Systems and Public Health, Department of Global Health, Faculty of Medicine and Health Sciences
[3] Stellenbosch University,Division of Epidemiology and Biostatistics, Department of Global Health, Faculty of Medicine and Health Sciences
[4] Stellenbosch University,Faculty of Medicine and Health Sciences
[5] University of the Witwatersrand,Division of Epidemiology and Biostatistics, School of Public Health, Faculty of Health Sciences
[6] University of Botswana,Department of Surgery