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Authors
Ma, Zhong
Yuan, Xianxia
Zhang, Zhenlin
Mei, Delong
Li, Lin
Ma, Zi-Feng
Zhang, Lei
Yang, Jun
Zhang, Jiujun
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Article History
Received: 14 August 2015
Accepted: 13 November 2015
First Online: 14 December 2015
Competing interests
: The authors declare no competing financial interests.
