Takahashi, Yu
Shinoda, Akihiro
Kamada, Haruhiko
Shimizu, Makoto
Inoue, Jun
Sato, Ryuichiro
Article History
Received: 12 November 2015
Accepted: 14 January 2016
First Online: 15 February 2016
Competing interests
: The authors declare no competing financial interests.