Funding for this research was provided by:
Tohoku University Center for Gender Equality Promotion
Research Institute of Electrical Communication, Tohoku University (Cooperative Research Project Program)
Grant-in-Aid for Scientific Research on Innovative Areas (No. 18H04180)
Received: 5 December 2018
Accepted: 25 July 2019
First Online: 4 November 2019
Ethics approval and consent to participate
: All the participants in all the experiments provided written informed consent and received an explanation of the study. The University Human Research Ethics Committee approved all the experimental procedures. All the methods were employed in accordance with the relevant guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.