Numata, Takashi http://orcid.org/0000-0001-6981-1766
Sato, Hiroki http://orcid.org/0000-0002-1364-2198
Asa, Yasuhiro
Koike, Takahiko
Miyata, Kohei
Nakagawa, Eri
Sumiya, Motofumi
Sadato, Norihiro http://orcid.org/0000-0002-9786-3907
Article History
Received: 16 April 2019
Accepted: 20 March 2020
First Online: 6 April 2020
Competing interests
: Takashi Numata, and Yasuhiro Asa are employed by Hitachi Ltd.; Hiroki Sato was employed by Hitachi Ltd. when he designed and conducted the experiments, and analyzed the experimental data.