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Authors
Ma, X.
Fang, F.
Li, Q.
Zhu, J.
Yang, Y.
Wu, Y. Z.
Zhao, H. B.
Lüpke, G.
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Article History
Received: 8 June 2015
Accepted: 5 October 2015
First Online: 28 October 2015
Competing interests
: The authors declare no competing financial interests.
