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Authors
Okamoto, Hajime
Watanabe, Takayuki
Ohta, Ryuichi
Onomitsu, Koji
Gotoh, Hideki
Sogawa, Tetsuomi
Yamaguchi, Hiroshi
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Article History
Received: 24 July 2015
Accepted: 26 August 2015
First Online: 19 October 2015
Competing interests
: The authors declare no competing financial interests.
