Funding for this research was provided by:
the 973 Program of the Ministry of Science and Technology of China (2015CB150601)
the National Natural Science Foundation of China (31371263; 31860021)
the Ba Gui Scholar Program of Guangxi Zhuang Autonomous Region of China (2014A002)
Article History
Received: 7 May 2019
Accepted: 27 January 2020
First Online: 18 February 2020
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: The authors declare that they have no competing interests.