Text and Data Mining valid from 2019-02-04
Received: 8 October 2018
Accepted: 29 January 2019
First Online: 4 February 2019
Ethics approval and consent to participate
: Ethics approval was issued by the Research Ethics Review Committee (RERC) of Mekelle University-College of Health Sciences and the consent to participate was waived since an already existing data were used. However, confidentiality was assured. Neither the raw data nor the processed data were used for any other purposes other than this study.
: Not applicable.
: The authors declare that they have no competing interests.
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