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Authors
Xie, Shang
Shan, Xiao-Feng
Shang, Kun
Xu, Hui
He, Jing
Cai, Zhi-Gang
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Article History
Received: 4 July 2014
Accepted: 29 September 2014
First Online: 15 October 2014
Competing interests
: The authors declare no competing financial interests.
