Chi, Yang
Zhu, Jinchao
Huag, Lan
Xu, Hao
Funding for this research was provided by:
National Natural Science Foundation of China (61472159)
Development Project of Jilin Province of China (20170203002GX, 20160414009GH, 20170101006JC, 20160204022GX)
China Postdoctoral Science Foundation (2016M601379)
MOE Research Center for Online Education Quantong Education Foundation (2017YB131)
Article History
Received: 21 December 2017
Revised: 18 January 2018
Accepted: 30 January 2018
First Online: 28 March 2018