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Authors
Peng, Bo
Zhang, Hao
Shao, Hezhu
Xu, Yuchen
Zhang, Xiangchao
Zhu, Heyuan
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Article History
Received: 27 September 2015
Accepted: 23 December 2015
First Online: 3 February 2016
Competing interests
: The authors declare no competing financial interests.
