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Authors
Li, Erfeng
Ling, Jian
Wang, Gang
Xiao, Jiling
Yang, Yuhong
Mao, Zhenchuan
Wang, Xuchu
Xie, Bingyan
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Article History
Received: 30 November 2014
Accepted: 28 July 2015
First Online: 3 September 2015
Competing interests
: The authors declare no competing financial interests.
