Text and Data Mining valid from 2018-07-31
Received: 21 December 2017
Accepted: 10 July 2018
First Online: 31 July 2018
Ethics approval and consent to participate
: This study was approved by the ethics committee of Ministry of Health of the State of Eritrea and National Commission for Higher Education. Written consent was obtained from all the participants.
: Not applicable.
: The authors declare that they have no competing interests.
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