Cui, Chenwei http://orcid.org/0000-0003-4189-7101
Pu, Yongping http://orcid.org/0000-0002-5757-799X
Funding for this research was provided by:
National Natural Science Foundation of China (51372144, 51641207)
Key Program of Innovative Research Team of Shaanxi Province (2014KCT-06)
National Undergraduate Training Programs for Innovation and Entrepreneurship (201710708009)
Article History
Received: 9 November 2017
Accepted: 10 January 2018
First Online: 9 April 2018