Ding, Yongqi
Zhao, Junfeng
Li, Bo
Zhao, Xu
Wang, Chao
Guo, Minghui
Lin, Yuqing
Funding for this research was provided by:
National Natural Science Foundation (21575090)
Beijing Municipal Natural Science Foundation (2162009)
Youth Talent Project of the Beijing Municipal Commission of Education (CIT&TCD201504072)
Youth Innovative Research Team of Capital Normal University
Article History
Received: 12 October 2017
Accepted: 11 January 2018
First Online: 25 January 2018
Compliance with ethical standards
: The author(s) declare that they have no competing interests.