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Authors
Yuan, Xianxia
Li, Lin
Ma, Zhong
Yu, Xuebin
Wen, Xiufang
Ma, Zi-Feng
Zhang, Lei
Wilkinson, David P.
Zhang, Jiujun
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Article History
Received: 9 November 2015
Accepted: 22 December 2015
First Online: 10 February 2016
Competing interests
: The authors declare no competing financial interests.
