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Authors
Cai, Xiao-Teng
Xu, Ping
Zhao, Ping-Xia
Liu, Rui
Yu, Lin-Hui
Xiang, Cheng-Bin
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Article History
Received: 5 May 2014
Accepted: 12 November 2014
First Online: 19 December 2014
Competing interests
: The authors declare no competing financial interests.
