Funding for this research was provided by:
National Natural Science Foundation of China (31672365)
Department of Education of Hebei Province (CXZZBS2019086)
Received: 15 November 2019
Accepted: 24 January 2020
First Online: 31 January 2020
Ethics approval and consent to participate
: This study was approved by the Animal Ethics Committee of Hebei Normal University as complying with the Animal protection law of the People’s Republic of China.
: Not applicable.
: The authors declare that they have no competing interests.