Funding for this research was provided by:
UK Department of International Development (6494)
Received: 2 June 2019
Accepted: 26 November 2019
First Online: 19 December 2019
Ethics approval and consent to participate
: Kenya ethics approval number is KEMRI/RES/7/3/1 and Malawi ethics approval number is P.05/14/1582.
: Not applicable.
: The authors declare that they have no competing interests.