Kizuka, Tokushi
Ashida, Shin
Article History
Received: 11 May 2015
Accepted: 29 July 2015
First Online: 26 August 2015
Competing interests
: The authors are the inventors of a pending patent in relation to the work applied for Japan Patent Office, which has already been assigned to the University of Tsukuba (Filing date: 1 July 2014. Application number: 2014-135740). If the University gains the patent revenue, they could earn a part of it.