1. Department of Health Sciences, Faculty of Health and Environmental Sciences, Central University of Technology, Bloemfontein, Free State, South Africa
2. Centre for Quality of Health and Living (CQHL), Faculty of Health and Environmental Sciences, Central University of Technology, Bloemfontein, Free State, South Africa
3. Department of Chemistry, Faculty of Natural and Agricultural Sciences, University of the Free State, Bloemfontein, South Africa
4. Faculty of Medicine, Nnamdi Azikiwe University, Awka (Nnewi Campus), Anambra State, Nigeria