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Authors
Semba, K
Namekata, K
Guo, X
Harada, C
Harada, T
Mitamura, Y
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Article History
Received: 11 November 2013
Revised: 13 April 2014
Accepted: 5 May 2014
First Online: 17 July 2014
Competing interests
: The authors declare no conflict of interest.
