Funding for this research was provided by:
National Natural Science Foundation of China (No. 81572900)
The Fundamental Research Funds for the Central Universities of Central South University (No. 1053320171187 and No. 2018zzts232)
The Undergraduate Training Programs for Innovation and Entrepreneurship (UTPIE, XCX20190537)
Text and Data Mining valid from 2019-12-01
Received: 28 July 2019
Accepted: 25 November 2019
First Online: 4 December 2019
Ethics approval and consent to participate
: Not applicable.
: All authors have agreed on the contents of the manuscript.
: The authors declare that they do not have any conflicts of interest related to this study. This manuscript has been read and approved by all the authors and has not been submitted to or is not under consider for publication elsewhere.