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Authors
Wu, Di
Zhang, Zhe
Li, Le
Zhang, Zongzhi
Zhao, H. B.
Wang, J.
Ma, B.
Jin, Q. Y.
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Article History
Received: 21 January 2015
Accepted: 26 June 2015
First Online: 20 July 2015
Competing interests
: The authors declare no competing financial interests.
