Tanimoto, Ryuichi
Hiraiwa, Takumi
Nakai, Yuichiro
Shindo, Yutaka
Oka, Kotaro
Hiroi, Noriko
Funahashi, Akira
Article History
Received: 22 September 2015
Accepted: 5 February 2016
First Online: 1 March 2016
Competing interests
: The authors declare no competing financial interests.