**Author details**

Zenzile Peter Khetsha1 \*, Moosa Mahmood Sedibe1 , Rudolph Johannes Pretorius1 , Phoka Caiphus Rathebe2 and Karabelo Moloantoa3

1 Central University of Technology, Free State, Bloemfontein, South Africa

2 University of Johannesburg, Johannesburg, South Africa

3 University of the Free State, Bloemfontein, South Africa

\*Address all correspondence to: zkhetsha@cut.ac.za

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