Text and Data Mining valid from 2019-07-30
Received: 26 November 2018
Accepted: 22 July 2019
First Online: 30 July 2019
Ethics approval and consent to participate
: Ethical clearance was requested and approved by the ethical committee of College of Health Sciences, Wollega University, Ethiopia.
: All authors have reviewed and consent for publication of this manuscript.
: The authors declare that they have no competing interests.