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Authors
Liang, Y
Li, Z
Liang, S
Li, Y
Yang, L
Lu, M
Gu, H F
Xia, N
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Article History
Received: 31 July 2015
Revised: 29 September 2015
Accepted: 10 November 2015
First Online: 25 January 2016
Competing interests
: The authors declare no conflict of interest.
