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Article History

Received: 18 September 2018

Accepted: 22 November 2018

First Online: 4 December 2018

Ethics approval and consent to participate

: This study was approved by the ethical review committee of University of Gondar. Written informed consent was also obtained before conducting this study. Participants’ information obtained was kept anonymous.

: Not applicable.

: The author declares that he has no competing interests.

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