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Authors
Quan, Runai
Zhai, Yiwei
Wang, Mengmeng
Hou, Feiyan
Wang, Shaofeng
Xiang, Xiao
Liu, Tao
Zhang, Shougang
Dong, Ruifang
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Article History
Received: 19 June 2015
Accepted: 4 July 2016
First Online: 25 July 2016
Competing interests
: The authors declare no competing financial interests.
