Funding for this research was provided by:
Japan Society for the Promotion of Science (JP17K01015, JP16H04992, 17K13866)
Received: 1 July 2020
Accepted: 4 February 2021
First Online: 31 March 2021
Ethics approval and consent to participate
: This survey was conducted under Japanese Privacy Information Protection Law and was approved by the Institute of Statistical Mathematics Ethical Review Board beforehand (No. R17-06). Participation was completely voluntary, and participants could withdraw at any time. Informed consent of all participants was obtained by the survey company.
: All authors reviewed the paper and consented for publication.
: The authors declare that they have no competing interests.