Funding for this research was provided by:
National Natural Science Foundation of China (31672366)
Received: 22 March 2019
Accepted: 28 May 2019
First Online: 18 June 2019
Ethics approval and consent to participate
: All animal procedures were performed in accordance with the applicable Chinese legislation and approved by the Animal and Medical Ethics Committee of the Institute of Zoology, Chinese Academy of Sciences.
: Not applicable.
: The authors declare that they have no competing interests.