Shang, Xinna
Chen, Zhibo
Sun, Guodong
Yang, Gaoxiang
Funding for this research was provided by:
Fundamental Research Funds for the Central Universities of China (No. 2017ZY20)
National Natural Science Foundation of China (No. 61300180)
Article History
Received: 16 November 2017
Accepted: 18 April 2018
First Online: 2 May 2018
Competing interests
: The authors declare that they have no competing interests.
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