Funding for this research was provided by:
Ministry of Education, Culture, Sports, Science and Technology, Japan (Funds for integrated promotion of social system reform and research and development (H22-26))
The Project Research Grant of Toho University School of Medicine (28-31)
Received: 30 January 2020
Accepted: 1 May 2020
First Online: 20 May 2020
Change Date: 19 June 2020
Change Type: Correction
Change Details: An amendment to this paper has been published and can be accessed via the original article.
Ethics approval and consent to participate
: The study protocol was approved by the Research Ethics Committee in Keio University Shonan Fujisawa Campus (No. 44) and the Ethics Committee of Faculty of Medicine, Toho University (No. 25104). All participants responded to the questionnaire after being informed about the purpose of the study and methods, autonomy of their participation, the right to withdraw, and confidentiality within the study. All data were anonymized to protect the privacy of participants.
: Not applicable.
: The authors declare that they have no competing interests.