Ethics statement
Before implementation, ethical approval of the protocol was received from Kenya Medical Research Institute’s Scientific Ethics Review Unit (KEMRI-SERU) and the University of Washington’s Institutional Review Board. Written informed consent to participate in the study was obtained from all participants and legal guardians of the illiterate participants before enrolment. All methods were carried out in accordance with the relevant guidelines and regulations. The trial was registered on 08/08/2019 at ClinicalTrials.gov, number NCT04050540[