Funding for this research was provided by:
National Natural Science Foundation of China (81270805)
Department of Science and Technology, Sichuan Provincial People's Government (2018SZ0378)
Article History
Received: 17 July 2019
Accepted: 11 September 2019
First Online: 21 October 2019
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: On behalf of all authors, the corresponding author states that there is no conflict of interest.