Funding for this research was provided by:
Kenya Medical Research Institute Internal Research Grant (L317)
Received: 7 February 2020
Accepted: 30 August 2020
First Online: 9 September 2020
Ethics approval and consent to participate
: The protocol was reviewed and approved by the KEMRI Scientific and Ethics Review Unit (SERU) and the Kenyatta University Ethical Review Committee (KU-ERC). All participants or parents/guardians were informed about the objectives of the study and signed written consent before enrollment into the study.
: The authors declare that they have no competing interests.