Higuchi, Hiroki http://orcid.org/0000-0002-4173-5594
Kobayashi, Tessei
Article History
Accepted: 21 December 2021
First Online: 8 January 2022
Declarations
:
: The authors declare that they have no competing interests.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The study was approved by the ethics committee of NTT Communication Science Laboratories.
: Informed consent was obtained from all individual participants included in the study.
: Not applicable.