Higaki, Yuji
Nishida, Jin
Takenaka, Ai
Yoshimatsu, Rika
Kobayashi, Motoyasu
Takahara, Atsushi
Article History
Received: 6 July 2015
Accepted: 27 July 2015
First Online: 16 September 2015
Competing interests
: The authors declare no conflict of interest.