Hirabayashi, Koichi
Nakazawa, Yozo
Sakashita, Kazuo
Kurata, Takashi
Saito, Shoji
Yoshikawa, Kentaro
Tanaka, Miyuki
Yanagisawa, Ryu
Koike, Kenichi
Article History
Received: 1 August 2014
Accepted: 20 October 2014
First Online: 6 November 2014
Competing interests
: The authors declare no competing financial interests.