Higaki, Takumi
Kutsuna, Natsumaro
Akita, Kae
Sato, Mayuko
Sawaki, Fumie
Kobayashi, Megumi
Nagata, Noriko
Toyooka, Kiminori
Hasezawa, Seiichiro
Article History
Received: 28 September 2014
Accepted: 16 December 2014
First Online: 15 January 2015
Competing interests
: The authors declare no competing financial interests.