1 South African National Cancer Registry, National Health Laboratory Service, Braamfontein Johannesburg 2000, South Africa; Faculty of Health Sciences, University of Witwatersrand, Johannesburg, South Africa. Electronic address: [email protected].
2 South African National Cancer Registry, National Health Laboratory Service, Braamfontein Johannesburg 2000, South Africa.
3 South African National Cancer Registry, National Health Laboratory Service, Braamfontein Johannesburg 2000, South Africa; Faculty of Health Sciences, University of Witwatersrand, Johannesburg, South Africa.
4 Faculty of Health Sciences, University of Witwatersrand, Johannesburg, South Africa; Charlotte Maxeke Johannebsurg Academic Hospital, Johannesburg, South Africa.