1. Cancer incidence and mortality worldwide: Sources, methods and major patterns in GLOBOCAN 2012
2. South African National Cancer Registry.Cancer in South Africa (2010). Cited Oct 25 2018. Available from URL:http://www.cansa.org.za/south-african-cancer-statistics
3. South African National Cancer Registry.Cancer in South Africa (2011). Cited Oct 25 2018. Available from URL:http://www.cansa.org.za/south-african-cancer-statistics/
4. South African National Cancer Registry.Cancer in South Africa (2012). Cited Oct 25 2018. Available from URL:http://www.cansa.org.za/south-african-cancer-statistics/
5. South African National Cancer Registry.Cancer in South Africa (2013). Cited Oct 25 2018. Available from URL:http://www.cansa.org.za/south-african-cancer-statistics/