Wang, Meng
Liu, Jun
Wei, Bifan
Yao, Siyu
Zeng, Hongwei
Shi, Lei
Funding for this research was provided by:
National Key Research and Development Program of China (2016YFB1000903)
National Natural Science Foundation of China (61672419, 61672418)
National Natural Science Foundation of China (61721002, 61532004)
National Natural Science Foundation of China (61532015)
MOE Research Center for Online Education Funds (2016YB16)
Ministry of Education Innovation Research Team (IRT17R86)
Article History
Received: 14 March 2017
Revised: 18 November 2017
Accepted: 5 January 2018
First Online: 19 January 2018