Funding for this research was provided by:
National Research Fund - Kenya (National Research Fund 2016/2017 grant award under the multidisciplinary-multi-institutional category involving Kenyatta University, University of Nairobi and The Cooperative University of Kenya)
Text and Data Mining valid from 2020-03-04
Received: 28 June 2019
Accepted: 18 February 2020
First Online: 4 March 2020
: The authors declare that they have no competing interests.