Received: 17 September 2020
Accepted: 28 January 2021
First Online: 6 February 2021
Ethics approval and consent to participate
: This study is covered by the ethical waiver granted by the University of the Witwatersrand’s Human Research Ethics Committee for NCR to perform its legislative mandate of cancer surveillance in South Africa and any related research studies that do not involve human tissue. The permission to use data was granted by the STATS SA and the NCR.
: Not applicable.
: The authors declare that they have no competing interests.