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Authors
Sun, X. H.
Qiao, J. W.
Jiao, Z. M.
Wang, Z. H.
Yang, H. J.
Xu, B. S.
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Article History
Received: 14 June 2015
Accepted: 11 August 2015
First Online: 10 September 2015
Competing interests
: The authors declare no competing financial interests.
