Katsuda, Shin-ichiro
Takazawa, Kenji
Miyake, Masao
Kobayashi, Daisuke
Kusanagi, Masahiko
Hazama, Akihiro
Article History
Received: 25 November 2013
Revised: 7 March 2014
Accepted: 5 April 2014
First Online: 10 July 2014
Competing interests
: The authors declare no conflict of interest.