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Authors
Li, Cai-Zhen
Wang, Li-Xian
Liu, Haiwen
Wang, Jian
Liao, Zhi-Min
Yu, Da-Peng
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Article History
Received: 24 August 2015
Accepted: 6 November 2015
First Online: 17 December 2015
Competing interests
: The authors declare no competing financial interests.
