1. Department of Engineering Sciences, University of the Free State, Bloemfontein, South Africa
2. Faculty of Science and Technology, Norwegian University of Life Sciences, Ås, Norway
3. Division of Virology, University of the Free State, Bloemfontein, South Africa
4. Department of Facilities Planning, University of the Free State, Bloemfontein, South Africa
5. Department of Soil and Crop and Climate Sciences, University of the Free State, Bloemfontein, South Africa
6. Department of Information and Communication Technology Services, University of the Free State, Bloemfontein, South Africa