Kimura, Yuka
Toyofuku, Yukiko
Koike, Shin
Shibuya, Norihiro
Nagahara, Noriyuki
Lefer, David
Ogasawara, Yuki
Kimura, Hideo
Article History
Received: 14 June 2015
Accepted: 9 September 2015
First Online: 6 October 2015
Competing interests
: The authors declare no competing financial interests.