Funding for this research was provided by:
Department of Education of Guangdong Province (2016KTSCX132)
Received: 21 October 2018
Accepted: 25 February 2019
First Online: 6 March 2019
: This study was performed by strictly following Animal management regulations of the People’s Republic of China. The study was approved by Huizhou University.
: Not applicable.
: The authors declare that they have no competing interests.
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