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Authors
Wu, Jing-Xiang
Cheng, Yun-Sheng
Wang, Jue
Chen, Lei
Ding, Mei
Wu, Jia-Wei
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Article History
Received: 7 May 2015
Accepted: 20 October 2015
First Online: 2 December 2015
Competing interests
: The authors declare no competing financial interests.
