Text and Data Mining valid from 2019-10-11
Received: 17 July 2018
Accepted: 26 August 2019
First Online: 11 October 2019
Ethics approval and consent to participate
: The study was approved by Mekelle University Institutional Review Board (ERC1305/2018). Written informed consent was obtained from each study participant and for those participants under the age of 18 years written informed consent was received from their legal guardians.
: Not applicable for this publication.
: The authors declare that they have no competing interests.