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Authors
Yu, Chao
Tan, Guozhen
Lv, Hongtao
Wang, Zhen
Meng, Jun
Hao, Jianye
Ren, Fenghui
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Article History
Received: 2 March 2016
Accepted: 20 May 2016
First Online: 10 June 2016
Competing interests
: The authors declare no competing financial interests.
