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Authors
Zheng, T. C.
Lin, W.
Liu, R.
Cai, D. J.
Li, J. C.
Li, S. P.
Kang, J. Y.
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Article History
Received: 9 December 2015
Accepted: 1 February 2016
First Online: 24 February 2016
Competing interests
: The authors declare no competing financial interests.
