Funding for this research was provided by:
Received: 8 June 2019
Accepted: 17 February 2020
First Online: 24 February 2020
Ethics approval and consent to participate
: Ethical approval was obtained for this study from the research ethics committees of the London School of Hygiene and Tropical Medicine and University of Ibadan/University College Hospital. All participants participated voluntarily without coercion after engaging them in due consent process. All those who did not consent were not recruited into the study.
: Not applicable.
: There is no competing interests.