Tagawa, M
Shirane, K
Yu, L
Sato, T
Furukawa, S
Mizuguchi, H
Kuji, R
Kawamura, K
Takahashi, N
Kato, K
Hayakawa, S
Sawada, S
Furukawa, K
Article History
Received: 15 February 2014
Revised: 14 April 2014
Accepted: 16 April 2014
First Online: 6 June 2014
Competing interests
: The authors declare no conflict of interest.