Funding for this research was provided by:
ExxonMobil through Accordia Global Health Foundation
Received: 17 September 2019
Accepted: 28 May 2020
First Online: 22 June 2020
Ethics approval and consent to participate
: The study protocol was reviewed and approved by the Research and Ethics Committees of the University of Ibadan/University College Hospital (NHREC/05/01/2008a; UI/EC/13/0032) and Niger Delta University Teaching Hospital (NDUTH/REC/2013/011). All respondents signed a written consent and voluntarily participated in the study.
: Not applicable.
: The authors declare that they have no competing interests.