Gou, Jun
Niu, Qingchen
Liang, Kai
Wang, Jun
Jiang, Yadong
Funding for this research was provided by:
National Natural Science Foundation of China (61501092)
National Science Funds for Creative Research Groups of China (61421002)
Article History
Received: 27 October 2017
Accepted: 23 February 2018
First Online: 5 March 2018
Competing Interests
: The authors declare that they have no competing interests.
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