Received: 18 September 2018
Accepted: 14 July 2019
First Online: 30 July 2019
Ethics approval and consent to participate
: Ethics approval was obtained from UNSW Human Research Ethics Committee (HREC HC17795). Ethics approval was also obtained from Gulu University Research Ethics Committee (GU REC). All participants gave informed consent.
: Not applicable.
: The authors declare that they have no competing interests.