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Authors
Sun, Yan
Xia, Zhijun
Shang, Zhi
Sun, Kaibo
Niu, Xiaomin
Qian, Liqiang
Fan, Liu-Yin
Cao, Cheng-Xi
Xiao, Hua
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Article History
Received: 7 December 2015
Accepted: 29 March 2016
First Online: 19 April 2016
Competing interests
: The authors declare no competing financial interests.
