Ethics approval
This study involves human participants and was approved by University of California San Francisco Institutional Review Board (IRB #: 18-25555) and Scientific and Ethics Review Unit (SERU) of the Kenya Medical Research Institute (KEMRI) #KEMRI/SERU/CCR/0104/3668. Written authorisation was obtained from the Migori County Director of Health. Formal written informed consent procedures were completed in the preferred language of each caregiver.