Funding for this research was provided by:
Jimma University (HRPC2016)
Text and Data Mining valid from 2019-11-20
Received: 25 May 2019
Accepted: 1 November 2019
First Online: 20 November 2019
Ethics approval and consent to participate
: The internal review board (IRB) of the Institute of Health, Jimma University, issued ethical clearance for this study (protocol number HRPC2016).
: Not applicable.
: The authors declare that they have no competing interests.