Received: 6 November 2019
Accepted: 27 January 2020
First Online: 5 February 2020
Ethics approval and consent to participate
: The University of Technology Sydney Human Research Ethics Committee (UTS-HREC-ETH17–2080) and the Sierra Leone Ethics and Scientific Review Committee granted ethical clearance. Written and oral was obtained from participants.
: Not applicable.
: The authors declare that they have no competing interest.