Igarashi, Kiyohiko
Uchihashi, Takayuki
Uchiyama, Taku
Sugimoto, Hayuki
Wada, Masahisa
Suzuki, Kazushi
Sakuda, Shohei
Ando, Toshio
Watanabe, Takeshi
Samejima, Masahiro
Article History
Received: 13 February 2014
Accepted: 25 April 2014
First Online: 4 June 2014
Competing interests
: The authors declare no competing financial interests.