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Authors
Tang, Liang
Wang, Qing-Yun
Cheng, Zhi-Peng
Hu, Bei
Liu, Jing-Di
Hu, Yu
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Article History
Received: 18 May 2016
Accepted: 16 August 2016
First Online: 7 September 2016
Competing interests
: The authors declare no competing financial interests.
