Wang, Tian
Chen, Guo
Pang, Huihui
Funding for this research was provided by:
Beijing College Students' Innovation and Entrepreneurship Training Program (201910019437)
Article History
Received: 25 May 2019
Accepted: 8 November 2019
First Online: 15 November 2019
Competing interests
: The authors declare that they have no competing interests.