Contributors
SSK, CS, TTW, AAO, TS, EAF, and PM designed the study. SSK, CS, HYB, and PM developed the study protocol. SSK and CS designed the data collection instruments with input from all authors. SSK, CS, and HYB implemented and supervised the fieldwork. SSK, CS, EAF, and PM developed the analysis strategy. SSK and CS analysed the data and wrote the first draft. All authors reviewed, made inputs to, and approved the final paper. All authors had full access to all de-identified anonymised data in the study and had final responsibility for the decision to submit the manuscript for publication. The underlying data were also accessible to and verified by CS.