Funding for this research was provided by:
National Natural Science Foundation of China (71704001, 71601002)
Natural Science Foundation of Anhui Province (1808085QG224)
Humanities and Social Science Key Project of Anhui Provincial Education Department (SK2019A0075)
Planning Funds of Philosophy and Social Science in Anhui Province (AHSKY2018D13; AHSKQ2016D19)
Humanities and Social Sciences Foundation of Ministry of Education of China (18YJC630249)
Article History
Received: 1 October 2019
Accepted: 17 February 2020
First Online: 10 March 2020
Competing interests
: The authors have declared that no competing interests exist.