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Authors
Peng, W-x
Wan, Y-y
Gong, A-h
Ge, L
Jin, J
Xu, M
Wu, C-y
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Article History
Received: 12 September 2016
Revised: 1 December 2016
Accepted: 20 December 2016
First Online: 30 January 2017
Competing interests
: The authors declare no conflict of interest.
