Maruyama, Noriko
Maruyama, Fumito
Takeuchi, Yasuo
Aikawa, Chihiro
Izumi, Yuichi
Nakagawa, Ichiro
Article History
Received: 24 April 2014
Accepted: 19 September 2014
First Online: 13 October 2014
Competing interests
: The authors declare no competing financial interests.