Funding for this research was provided by:
Text and Data Mining valid from 2019-09-18
Received: 25 July 2018
Accepted: 4 September 2019
First Online: 18 September 2019
Ethics approval and consent to participate
: Ethical approval was obtained from Mekelle University ethical clearance committee and written informed consent was taken from the study participants.
: Not applicable
: The authors declare that they have no competing interests.