Received: 26 October 2018
Accepted: 6 February 2019
First Online: 15 April 2019
Ethics approval and consent to participate
: Ethical approval was obtained from the Lagos University Teaching Hospital (LUTH) Health Research Ethics Committee and all participants provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.