Kumamoto, Akihito
Shibata, Naoya
Nayuki, Kei-ichiro
Tohei, Tetsuya
Terasaki, Nobuyuki
Nagatomo, Yoshiyuki
Nagase, Toshiyuki
Akiyama, Kazuhiro
Kuromitsu, Yoshirou
Ikuhara, Yuichi
Article History
Received: 11 November 2015
Accepted: 23 February 2016
First Online: 10 March 2016
Competing interests
: The authors declare no competing financial interests.