Ishikawa, Kazuya
Yamaguchi, Koji
Sakamoto, Kazuaki
Yoshimura, Satomi
Inoue, Kento
Tsuge, Seiji
Kojima, Chojiro
Kawasaki, Tsutomu
Article History
Received: 12 August 2014
Accepted: 1 October 2014
First Online: 12 November 2014
Competing interests
: The authors declare no competing financial interests.