Yokoi, Hiroki
Hiraoka, Yuya
Hiroto, Satoru
Sakamaki, Daisuke
Seki, Shu http://orcid.org/0000-0001-7851-4405
Shinokubo, Hiroshi
Article History
Received: 17 April 2015
Accepted: 29 July 2015
First Online: 4 September 2015
Competing interests
: The authors declare no competing financial interests.