Funding for this research was provided by:
Innovative Research Group Project of the National Natural Science Foundation of China (81703490)
The Undergraduate Innovation and Entrepreneurship Training Program of Shandong (S201910443008)
), The Undergraduate Innovation and Entrepreneurship Training Program of Jining Medical University (cx2019026)
NSFC cultivation project of Jining Medical University (JYP2018KJ06)
Article History
Received: 20 August 2020
Accepted: 26 September 2020
First Online: 19 October 2020
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.