Funding for this research was provided by:
the National Natural Science Foundation of China (61573291, 61573096)
the Grant of China Scholarship Council (201408505020)
the Fundamental Research Funds for Central Universities (XDJK2016B036)
the Jiangsu Provincial Key Laboratory of Networked Collective Intelligence under Grant (BM2017002)
Article History
Received: 12 October 2017
Accepted: 9 June 2018
First Online: 19 June 2018
Compliance with ethical standards
:
: The authors declare that there is no conflict of interest.