Funding for this research was provided by:
Natural Sciences Foundation of China (81500041)
Natural Science Foundation of Hunan Province, China (2019JJ80106)
Received: 30 July 2020
Accepted: 29 July 2021
First Online: 11 August 2021
: This study was approved by the institutional review board in the form of modified teaching method study, so that ethical review was waived.
: IRB approval was granted for waiver of written informed consent due to minimal risk and the need to prevent full disclosure that may have induced bias.
: The authors report no competing interests.