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Authors
Yan, Xiaozhi
Dong, Haini
Li, Yanchun
Lin, Chuanlong
Park, Changyong
He, Duanwei
Yang, Wenge
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Article History
Received: 14 January 2016
Accepted: 6 April 2016
First Online: 13 May 2016
Competing interests
: The authors declare no competing financial interests.
