| Affiliation: | 1. Department of Mathematics and Statistical Sciences, Botswana International University of Science and Technology, Private Bag 16, Palapye, Botswana;2. Department of Physics & Astronomy, Botswana International University of Science and Technology, Private Bag 16, Palapye, Botswana;1. School of Science, Xi’an University of Technology, Xi’an 710048, PR China;2. Department of Mathematics and Statistics, University of Ottawa, Ottawa ON K1N 6N5, Canada;3. Centre for Communicable Disease and Infection Contorl, Public Health Agency of Canada, Ottawa ON K1A0K9, Canada;4. Centre for Disease Modeling, York Institute of Health Research, York University, Toronto ON M3J 1P3, Canada |
