Received: 26 May 2019
Accepted: 30 January 2020
First Online: 11 February 2020
Ethics approval and consent to participate
: Approval to conduct the study was obtained from the ethical committee of College of Natural Sciences Institutional Ethics Review Board, Addis Ababa University. Consent was also obtained from Abeshge district (woreda) administration and the manager of each study site after the purpose of the investigation was explained to them.
: Not applicable.
: The authors declare that they have no competing interests.