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Authors
Sakai, Takamasa
Katashima, Takuya
Matsushita, Takuto
Chung, Ung-il
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Article History
Received: 26 August 2015
Revised: 19 October 2015
Accepted: 13 November 2015
First Online: 20 January 2016
Competing interests
: The authors declare no conflict of interest.
Free to read: This content has been made available to all.
