Funding for this research was provided by:
Bill and Melinda Gates Foundation (OPP1192416 I)
Received: 11 November 2019
Accepted: 25 November 2020
First Online: 1 December 2020
Ethics approval and consent to participate
: Ethical clearance was obtained from the National Health Research Ethics Committee, Nigeria. The study participants were also informed about the objectives of the study, privacy, and data protection and gave informed consent before been interviewed.
: No consent to publish was needed for this study as the authors did not use any details, images or videos related to individual participants.
: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.