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Authors
Hu, J. F.
Peng, P. A.
Liu, M. Y.
Xi, D. P.
Song, J. Z.
Wan, X. Q.
Wang, C. S.
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Article History
Received: 28 January 2015
Accepted: 27 February 2015
First Online: 7 May 2015
Competing interests
: The authors declare no competing financial interests.
