1. Department of Pharmacology, University of the Free State, Bloemfontein, South Africa
2. Laser Research Centre, Faculty of Health Sciences, University of Johannesburg, Johannesburg, South Africa
3. Department of Pharmaceutical Chemistry, College of Pharmacy, University of Attahadi, Tripoli, Libya
4. School of Chemistry and Physics, University of KwaZulu-Natal, Durban, South Africa
5. Department of Microbiology and Biochemistry, University of the Free State, Bloemfontein, South Africa
6. Molecular Bio-computation and Drug Design Laboratory, School of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
7. Department of Pure and Industrial Chemistry, Faculty of Physical Sciences, University of Nigeria, Nsukka, Nigeria