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Authors
Zhao, Qian
Li, G. R.
Song, Jian
Zhao, Yulong
Qiang, Yinghuai
Gao, X. P.
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Article History
Received: 25 July 2016
Accepted: 11 November 2016
First Online: 9 December 2016
Competing interests
: The authors declare no competing financial interests.
