Cui, Dan
Arima, Mitsuru
Takubo, Keiyo
Kimura, Tokuhiro
Horiuchi, Keisuke
Minagawa, Takuya
Matsuda, Satoshi
Ikeda, Eiji
Article History
Received: 10 March 2015
Accepted: 10 July 2015
First Online: 5 August 2015
Competing interests
: The authors declare no competing financial interests.