Minamikawa, Takeo
Harada, Yoshinori
Takamatsu, Tetsuro
Article History
Received: 22 May 2015
Accepted: 19 October 2015
First Online: 25 November 2015
Competing interests
: The authors declare competing financial interests. T.T., Y.H. and T.M. have received research financial support from Toray Engineering Co., Ltd., Tokyo, Japan. T.M., Y.H. and T.T. have filed a patent related to this work.