1. Institute of Basic Sciences Technology and Innovation, Pan African University-Jomo Kenyatta University of Agriculture and Technology, P.O. Box 62000-00200, Nairobi, Kenya
2. National Advanced School of Engineering, University of Maroua, P.O. Box 46 Maroua, Cameroon
3. Faculty of Science, University of Yaounde I, P.O. Box 812, Yaounde, Cameroon
4. School of Computing and Information Technology, Jomo Kenyatta University of Agriculture and Technology, P.O. Box 62000-00200, Nairobi, Kenya