Ichimura, Koichiro
Miyazaki, Naoyuki
Sadayama, Shoji
Murata, Kazuyoshi
Koike, Masato
Nakamura, Kei-ichiro
Ohta, Keisuke
Sakai, Tatsuo
Article History
Received: 12 November 2014
Accepted: 12 February 2015
First Online: 11 March 2015
Competing interests
: The authors declare no competing financial interests.