Received: 24 July 2018
Accepted: 10 September 2018
First Online: 24 September 2018
Ethics approval and consent to participate
: The study was conducted after obtaining ethical clearance from the Jimma University Health Institute Faculty of Health Sciences Ethical Review Board. A permission letter was obtained from the Jimma town Municipality Office. Written informed consent was obtained from all study participants.
: Not applicable
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.