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Authors
Nohara, Chiyo
Hiyama, Atsuki
Taira, Wataru
Tanahara, Akira
Otaki, Joji M.
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Article History
Received: 17 January 2014
Accepted: 22 April 2014
First Online: 15 May 2014
Competing interests
: The authors declare no competing financial interests.
