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Authors
Xu, Su
Jiang, Yuyu
Xu, Hongyi
Wang, Junxia
Lin, Shisheng
Chen, Hongsheng
Zhang, Baile
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Article History
Received: 17 February 2014
Accepted: 7 May 2014
First Online: 9 June 2014
Competing interests
: The authors declare no competing financial interests.
