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Authors
Yokoyama, Hikaru
Ogawa, Tetsuya
Kawashima, Noritaka
Shinya, Masahiro
Nakazawa, Kimitaka
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Article History
Received: 13 April 2016
Accepted: 29 September 2016
First Online: 2 November 2016
Competing interests
: The authors declare no competing financial interests.
