Akahori, Rena
Yanagi, Itaru
Goto, Yusuke
Harada, Kunio
Yokoi, Takahide
Takeda, Ken-ichi
Article History
Received: 21 February 2017
Accepted: 10 July 2017
First Online: 22 August 2017
Competing Interests
: Financial support for this study was provided by Hitachi, Ltd. R.A., I.Y., Y.G., K.H., T.Y. and K.T. are current employees of Hitachi, Ltd.