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Authors
Shen, Feng-Min
Zhu, Lian
Ye, Heng
Yang, Yu-Jun
Pang, Dai-Wen
Zhang, Zhi-Ling
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Article History
Received: 25 February 2015
Accepted: 11 June 2015
First Online: 7 July 2015
Competing interests
: The authors declare no competing financial interests.
