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Authors
Song, Wan-lu
Yin, Zhang-qi
Yang, Wan-li
Zhu, Xiao-bo
Zhou, Fei
Feng, Mang
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Article History
Received: 11 September 2014
Accepted: 9 December 2014
First Online: 13 January 2015
Competing interests
: The authors declare no competing financial interests.
