Li, Yan
Sun, Bao
Yu, Shangyao
Funding for this research was provided by:
National Natural Science Foundation of China (71272150, 71602005)
National Planning Office of Philosophy and Social Science (15AZD012)
Ministry of Education of the People's Republic of China (15YJC630164)
Article History
Received: 27 September 2018
Accepted: 8 July 2019
First Online: 16 September 2019
Competing interests
: The authors declare that they have no competing interests.