Received: 6 May 2021
Accepted: 30 September 2021
First Online: 13 October 2021
: This study received ethics approval from the KEMRI Scientific and Ethics Review Unit (SERU), approval number KEMRI/SERU/CGMR-C/132/3735, Council of Governors, Kenya, National Commission for Science, Technology and Innovation (NACOSTI) serial no. A17531. All individuals gave written informed consent. All methods were performed in accordance with relevant guidelines and regulations.
: This study did not include any individual level data. This paper is published with the permission of the director KEMRI.
: The authors declare that they have no competing interests.