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Authors
Liu, X. Y.
Shan, C. X.
Zhu, H.
Li, B. H.
Jiang, M. M.
Yu, S. F.
Shen, D. Z.
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Article History
Received: 26 March 2015
Accepted: 3 August 2015
First Online: 1 September 2015
Competing interests
: The authors declare no competing financial interests.
