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Authors
Shi, Yuheng
Yuan, Bofeng
Qi, Nan
Zhu, Wenting
Su, Jingru
Li, Xiaoyan
Qi, Peipei
Zhang, Dan
Hou, Fajian
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Article History
Received: 22 January 2015
Accepted: 15 June 2015
First Online: 17 July 2015
Competing interests
: The authors declare no competing financial interests.
