1. Department of Electrical, Electronic and Computer Engineering, University of Pretoria, Pretoria, South Africa
2. Discipline of Electrical, Electronic and Computer Engineering, University of Kwazulu-Natal, Durban, South Africa
3. Department of Electrical Engineering, University of Sharjah, Sharjah, United Arab Emirates
4. Department of Electrical, Engineering, University of Dar es Salaam, Dar es Salaam, Tanzania