Funding for this research was provided by:
National Natural Science Foundation of China (31600650)
Department of Science and Technology of Sichuan Province (2017SYXHZ0039(P.S.))
Article History
Received: 11 September 2019
Revised: 25 November 2019
Accepted: 8 December 2019
First Online: 8 January 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.