Funding for this research was provided by:
National Natural Science Foundation of China (71501055, 71601066, 71690230, 71690235)
Natural Science Foundation of Anhui Province (1708085QG164, 1808085QG220)
Humanities and Social Science Foundation of Ministry of Education of China (16YJC630093)
Article History
Received: 12 October 2018
Accepted: 14 March 2019
First Online: 20 March 2019