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Authors
Lei, Baiying
Yao, Yuan
Chen, Siping
Li, Shengli
Li, Wanjun
Ni, Dong
Wang, Tianfu
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Article History
Received: 21 January 2015
Accepted: 10 July 2015
First Online: 31 July 2015
Competing interests
: The authors declare no competing financial interests.
