Sakai, Akihiro
Kanno, Tsutomu
Takahashi, Kouhei
Tamaki, Hiromasa
Kusada, Hideo
Yamada, Yuka
Abe, Hiroya
Article History
Received: 3 June 2014
Accepted: 30 July 2014
First Online: 15 August 2014
Competing interests
: The authors declare no competing financial interests.