Hara, Taichi
Hashimoto, Yukiko
Akuzawa, Tomoko
Hirai, Rika
Kobayashi, Hisae
Sato, Ken
Article History
Received: 23 June 2014
Accepted: 21 October 2014
First Online: 11 November 2014
Competing interests
: The authors declare no competing financial interests.