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Authors
Li, Hu
Shao, Renfu
Song, Nan
Song, Fan
Jiang, Pei
Li, Zhihong
Cai, Wanzhi
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Article History
Received: 27 November 2014
Accepted: 22 January 2015
First Online: 23 February 2015
Competing interests
: The authors declare no competing financial interests.
