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Article History

Received: 19 November 2018

Accepted: 22 April 2019

First Online: 10 May 2019

Ethics approval

: The animal protocol used in this study was approved by the Research Ethics Committee of the College of Life Science and Engineering, Foshan University. There are no vulnerable populations involved, and no endangered species was used in the experiments. Farm managers provided verbal consent to collect the samples.

: Not applicable.

: The authors declare that they have no competing interests.

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