Konagaya, Shuhei
Ando, Takeshi
Yamauchi, Toshiaki
Suemori, Hirofumi
Iwata, Hiroo
Article History
Received: 7 April 2015
Accepted: 5 October 2015
First Online: 17 November 2015
Competing interests
: S.K., H.S. and H.I. declare no competing financial interests. T.A. and T.Y. are employees of Panasonic Corporation.