Funding for this research was provided by:
Medical Research Council (MR/M01472X/1)
Received: 30 June 2020
Accepted: 18 September 2020
First Online: 29 September 2020
Ethics approval and consent to participate
: Ethical approvals were granted by the School of Medicine Research Ethics Committee at the Faculty of Medicine and Health at the University of Leeds (ref: SoMREC/14/097) and the Health Research Ethics Committee at the University of Nigeria Teaching Hospital (ref: NHREC/05/02/2008B-FWA00002458-1RB00002323). Written informed consent was obtained from all study participants and they were assured of confidentiality during reporting of findings.
: Not Applicable.
: The authors declare that they have no competing interests.