Cheng, Hao
Zhang, Jian
Wu, Qiang
An, Ping
Liu, Zhi
Funding for this research was provided by:
National Natural Science Foundation of China (U1301257)
National Natural Science Foundation of China (61571285, 61422111.)
Article History
Received: 4 November 2016
Accepted: 22 August 2017
First Online: 2 September 2017
Competing interests
: The authors declare that they have no competing interests.
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