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Authors
Shi, Zhenhua
Yu, Hui
Sun, Yongyan
Yang, Chuanjun
Lian, Huiyong
Cai, Peng
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Article History
Received: 14 August 2014
Accepted: 21 January 2015
First Online: 16 February 2015
Competing interests
: The authors declare no competing financial interests.
