Okada, Yukinori
Momozawa, Yukihide
Ashikawa, Kyota
Kanai, Masahiro
Matsuda, Koichi http://orcid.org/0000-0001-7292-2686
Kamatani, Yoichiro
Takahashi, Atsushi
Kubo, Michiaki
Article History
Received: 28 November 2014
Accepted: 27 April 2015
First Online: 1 June 2015
Competing interests
: The authors declare no competing financial interests.