Article History
Received: 30 May 2019
Accepted: 13 July 2020
First Online: 29 July 2020
Ethics approval and consent to participate
: The research does not involve collection of samples from human or animal subjects. Advocate visits were paid to the kings and high chiefs of the selected towns and villages to intimate them on the research and to obtain permission.
: Not applicable
: The authors declare that there is no competing interest.