Received: 7 August 2019
Accepted: 3 October 2019
First Online: 21 October 2019
Ethics approval and consent to participate
: Ethical approval was obtained from the Institutional Review Board of Jimma University with a reference number of HRPGC/235/2016. Written informed consent was also taken from the study participants. Confidentiality of information was also kept properly.
: Not applicable.
: The authors declare that they have no competing interests.