Ohta, Kenji
Ichimaru, Kota
Einaga, Mari
Kawaguchi, Sho
Shimizu, Katsuya
Matsuoka, Takahiro
Hirao, Naohisa
Ohishi, Yasuo
Article History
Received: 31 December 2014
Accepted: 15 October 2015
First Online: 9 November 2015
Competing interests
: The authors declare no competing financial interests.