Funding for this research was provided by:
Japan Society for the Promotion of Science (JP15H05709, JP16H01866, JP17H00875, JP18H04199, JP18K12015, JP20H04581)
Received: 1 July 2019
Accepted: 2 November 2020
First Online: 19 November 2020
Ethics approval and consent to participate
: The experiment was conducted in accordance with guidelines from the Declaration of Helsinki (2013). The ethics committee of Kyushu University approved the protocol (Approval Number: 2019–003). The experiment was single blind, meaning that participants were given an initial explanation of the experiment, for which they provided informed consent. After participation, researchers disclosed the real purpose of the experiment, and subjects were given another opportunity to provide informed consent.
: Not applicable.
: The authors declare that they have no competing interests.