Yoshida, R
Nakayama, H
Nagata, M
Hirosue, A
Tanaka, T
Kawahara, K
Nakagawa, Y
Matsuoka, Y
Sakata, J
Arita, H
Hiraki, A
Shinohara, M
Ito, T
Article History
Received: 23 May 2014
Revised: 12 August 2014
Accepted: 16 September 2014
First Online: 14 October 2014
Competing interests
: The authors declare no conflict of interest.