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Authors
Zhang, Qi-Qi
Cai, Bang-Xin
Xu, Wen-Jie
Gang, Hong-Ze
Liu, Jin-Feng
Yang, Shi-Zhong
Mu, Bo-Zhong
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Article History
Received: 27 November 2014
Accepted: 24 March 2015
First Online: 6 May 2015
Competing interests
: The authors declare no competing financial interests.
