Endo, Akiko
Watanabe, Takayasu
Ogata, Nachiko
Nozawa, Takashi
Aikawa, Chihiro
Arakawa, Shinichi
Maruyama, Fumito
Izumi, Yuichi
Nakagawa, Ichiro
Article History
Received: 26 February 2014
Revised: 11 July 2014
Accepted: 17 July 2014
First Online: 29 August 2014
Competing interests
: The authors declare no conflict of interest.