Participation in the study was strictly voluntary. Study staff reviewed the information sheet with potential participants and explained the details of the study. This included the voluntary nature of participation, inclusion and exclusion criteria, study implementation processes (e.g. that the interview would be audio-recorded), potential risks and benefits of participation, results sharing and that they could withdraw their participation at any time. It was also explained that an item as a token would be given as appreciation for their participation, which was identified by the study team and appropriate for the context of the study sites.