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Article History

Received: 23 April 2017

Accepted: 7 January 2018

First Online: 15 January 2018

Ethics approval and consent to participate

: Ethical approval for animal studies was approved by the animal ethics and welfare committee of the University of Gondar. Written informed consent was provided to animal owners who participated in the study.

: Not applicable

: The authors declare that they have no competing interests.

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