Okahara, Yoji
Takano, Kouji
Nagao, Masahiro
Kondo, Kiyohiko
Iwadate, Yasuo
Birbaumer, Niels
Kansaku, Kenji
Article History
Received: 14 February 2018
Accepted: 1 November 2018
First Online: 14 November 2018
Competing Interests
: The authors declare no competing interests.