Funding for this research was provided by:
National Natural Science Foundation of China (31771830, 31701335)
Chongqing Science and Technology Commission (cstc2016shmszx80083)
Higher Education Discipline Innovation Project (B12006)
National Basic Research Program of China (973 Program) (2016YFD0100202)
Fundamental Research Funds for Central Universities (XDJK2017A009)
Received: 24 December 2018
Accepted: 11 July 2019
First Online: 1 August 2019
Ethics approval and consent to participate
: Not applicable<i>.</i>
: Not applicable.
: The authors declare that they have no competing interests.