Funding for this research was provided by:
National Natural Science Foundation of China (81701395)
Article History
Received: 16 January 2020
Accepted: 2 May 2020
First Online: 23 May 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All authors have read the manuscript and authorized the submission for publication.
: All procedures performed in studies involving animals were in accordance with the ethical standards of the Experimental Animal Welfare Ethics Branch of Biomedical Ethics Committee of Peking University [permit no. LA2018022]. Appropriate guidelines for the use of animals have been followed.