Funding for this research was provided by:
the Key Research & Development program of Sichuan Province, China (2019YFN0019)
Sichuan Provincial Bureau of Environmental Protection (17ZA0412)
Postgraduate Innovation Fund Project by Southwest University of Science and Technology (19ycx0074)
Article History
Received: 16 March 2020
Accepted: 6 July 2020
First Online: 13 July 2020
Ethics Approval and Consent to Participate
: Not applicable.
: Not applicable.
: The authors declare that they have no competing interests.