Nakagawa, Akira
Matsumura, Eitaro
Koyanagi, Takashi
Katayama, Takane
Kawano, Noriaki
Yoshimatsu, Kayo
Yamamoto, Kenji
Kumagai, Hidehiko
Sato, Fumihiko
Minami, Hiromichi
Article History
Received: 30 October 2015
Accepted: 7 December 2015
First Online: 5 February 2016
Competing interests
: The authors declare no competing financial interests.