Funding for this research was provided by:
Addis Ababa University thematic Fund
Text and Data Mining valid from 2019-12-01
Received: 17 May 2019
Accepted: 7 December 2019
First Online: 19 December 2019
Ethics approval and consent to participate
: Not applicable.
: Authors give full permission for the publication, reproduction, and broadcast.
: The authors declare no conflict of interest. The funding sponsors had no role in the design of the study; in the data collection, analyses, or interpretation of data; and in the decision to publish the results.