Kawahata, Hirohisa
Sotobayashi, Daisuke
Aoki, Motokuni
Shimizu, Hideo
Nakagami, Hironori
Ogihara, Toshio
Morishita, Ryuichi
Article History
Received: 25 November 2014
Revised: 8 December 2014
Accepted: 15 December 2014
First Online: 19 February 2015
Competing interests
: The authors declare no conflict of interest.