Article History
Received: 6 September 2019
Accepted: 20 January 2020
First Online: 31 January 2020
Compliance with ethical standards
:
: The study has been approved by the Haramaya University research ethics committee whose names are Awol Seid (PhD) and Admkew Haile (M.Sc). Thus, all procedures performed in the study involving human participants were in accordance with the ethical standards of the Haramaya University research system. The study is retrospective; hence, formal consent is not required.
: The authors declare that they have no conflict of interest.