Takei, Y
Okamoto, S
Kawamura, K
Jiang, Y
Morinaga, T
Shingyoji, M
Sekine, I
Kubo, S
Tada, Y
Tatsumi, K
Shimada, H http://orcid.org/0000-0002-1990-8217
Hiroshima, K
Yamaguchi, N
Tagawa, M
Article History
Received: 21 November 2014
Revised: 2 July 2015
Accepted: 3 July 2015
First Online: 7 August 2015
Competing interests
: The authors declare no conflict of interest.