Funding for this research was provided by:
National Science and Technology Major Project of China (2018ZX03001026-002)
Doctoral Candidate Innovative Talent Project of CQUPT (BYJS201807)
Science Technology Project of Chongqing Education Commission (KJQN201800618)
Article History
Received: 29 December 2019
Accepted: 14 May 2020
First Online: 8 June 2020
Competing interests
: The authors declare that they have no competing interests.