Funding for this research was provided by:
Ministry of Health, Labour and Welfare (H29-Gantaisaku-ippan-009)
First Online: 30 June 2020
Compliance with Ethical Standards
: The funding organization had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; or decision to submit the manuscript for publication.
: Ethical approval was granted by the ethics committee of Keio University School of Medicine, under authorization number 20190338. We only obtained data from those who have given consent for the prefecture that administers the questionnaire to provide their response data to a third party for research use. Respondents must give their consent on the LINE chatbot before they proceed to the questionnaire response page.