Funding for this research was provided by:
UK Medical Research Council (MRC) and UK Department (MR/L00464X/1)
Received: 11 September 2020
Accepted: 17 June 2021
First Online: 2 July 2021
: The Ethical approval to conduct study was obtained from Ministries and Directorate in Sokoto, Kebbi and Zamfara with approval reference numbers MAH&FD/VET/166/11, MAHF/VET/VOL1, and DAHLD/SUB/VET/VOL.1 respectively. Written consent to participate in the study was obtained from farmers.
: Not applicable.
: The authors have no competing interest to declare