Received: 26 December 2019
Accepted: 7 July 2020
First Online: 17 August 2020
Ethics approval and consent to participate
: The research was approved by the departmental ethical review board (Ethics Committee for Experimental and Survey Research with Human Participants, The University of Tokyo’s Graduate School of Interdisciplinary Information Studies; Protocol #3) and informed consent was obtained from the participants.
: Not applicable.
: The authors declare that they have no competing interests.