1. Department of Biological Sciences, School Pure and Applied Sciences, University of Embu, Embu, Kenya
2. Department of Marketing and Management, School of Business, Africa Nazarene University, Nairobi, Kenya
3. Department of Botany, School of Biological Sciences, Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya
4. Department of Education Arts, School of Education, Meru University of Science and Technology, Meru, Kenya