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Authors
Ma, Jinyong
You, Cai
Si, Liu-Gang
Xiong, Hao
Li, Jiahua
Yang, Xiaoxue
Wu, Ying
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Article History
Received: 19 December 2014
Accepted: 1 May 2015
First Online: 10 June 2015
Competing interests
: The authors declare no competing financial interests.
