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Authors
Zhu, Ao
Guo, Jianhua
Ni, Bing-Jie
Wang, Shuying
Yang, Qing
Peng, Yongzhen
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Article History
Received: 19 November 2014
Accepted: 20 January 2015
First Online: 16 February 2015
Competing interests
: The authors declare no competing financial interests.
