Funding for this research was provided by:
Beijing Social Science Foundation (14WYB040)
First Class University, First Class Discipline Construction Funds of Minzu University of China (2017MDYL12)
National Natural Science Foundation of China (61309012)
National Key Technology Research and Development Program of the Ministry of Science and Technology of China (2014BAK10B03)
Article History
Received: 17 August 2017
Revised: 15 September 2017
Accepted: 22 September 2017
First Online: 16 October 2017