Ethics approval and consent to participate
Ethics approval was received from all pertinent approving bodies in Kenya and the USA: University of Washington’s Institutional Review Board (UW IRB STUDY00007487), Kenya Medical Research Institute Scientific Ethics Review Unit (KEMRI SERU P00122/3915), and Pharmacy and Poisons Board (PPB ECCT 19/11/02/2020(013). 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 relevant guidelines and regulations of the Kenyan Ministry of Health.