Article History
Received: 20 August 2018
Accepted: 25 August 2019
First Online: 2 September 2019
Ethics approval and consent to participate
: The University of Fort Hare and Ondo State Ministry of Health’s Ethical Review Committees approved the study protocol. All study participants gave written consent to indicate their voluntary participation.
: Not applicable
: The first author is an associate editor with BMC Public Health. Other authors declare that they have no competing interests.