Funding for this research was provided by:
Natural Science Foundation for Excellent Youth Scholars of Hebei Province of China (C2017205135)
Natural Science Fund for Distinguished Young Scholars of Hebei Normal University (L2017J04)
Hebei Normal University Doctor Initial Science Foundation (L2017B13)
Youth Foundation of Hebei Province Department of Education Fund (QN2017092)
Received: 29 July 2019
Accepted: 19 December 2019
First Online: 30 December 2019
Ethics approval and consent to participate
: This study was approved by the Animal Ethics Committee of Hebei Normal University (protocol number: 165031) 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.