Yamauchi, Hajime
Matsumaru, Takanori
Morita, Tomoko
Ishikawa, Susumu
Maenaka, Katsumi
Takigawa, Ichigaku
Semba, Kentaro
Kon, Shunsuke
Fujita, Yasuyuki
Article History
Received: 9 July 2015
Accepted: 23 September 2015
First Online: 20 October 2015
Competing interests
: The authors declare no competing financial interests.