Kagawa, Fumitaka http://orcid.org/0000-0002-1763-6799
Minami, Nao
Horiuchi, Sachio
Tokura, Yoshinori
Article History
Received: 21 November 2015
Accepted: 11 January 2016
First Online: 16 February 2016
Competing interests
: The authors declare no competing financial interests.