Funding for this research was provided by:
Science Research Foundation of Yunnan Education Bureau (2020J0680)
Received: 28 March 2020
Accepted: 9 February 2021
First Online: 23 February 2021
Ethics approval and consent to participate
: All participants had signed an approval consent before the experiment, which was given by the executive council of Southwest University. The experimenters could quit the experiment at any time, and their data will be protected and used for scientific research.
: Not applicable.
: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential competing interests.