Okamoto, S
Jiang, Y
Kawamura, K
Shingyoji, M
Tada, Y
Sekine, I
Takiguchi, Y
Tatsumi, K
Kobayashi, H
Shimada, H
Hiroshima, K
Tagawa, M
Article History
Received: 21 July 2014
Revised: 6 October 2014
Accepted: 6 October 2014
First Online: 13 November 2014
Competing interests
: The authors declare no conflict of interest.