Kishikawa, Takahiro
Otsuka, Motoyuki http://orcid.org/0000-0003-2869-2881
Yoshikawa, Takeshi
Ohno, Motoko
Ijichi, Hideaki
Koike, Kazuhiko
Article History
Received: 28 December 2015
Accepted: 23 August 2016
First Online: 26 September 2016
Competing interests
: The authors declare no competing financial interests.