Funding for this research was provided by:
Japan Agency for Medical Research and Development (16ck0106215)
JSPS KAKENHI (17K01469)
Received: 14 July 2019
Accepted: 5 July 2020
First Online: 17 July 2020
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This study was approved by the research ethics committees of Keio University (Approval No. 20120291) and Teine Keijinkai Hospital. Only respondents who returned the research guidelines and consent form along with the questionnaires were included in the analysis. Written informed consent was obtained from all individual participants included in the study.
: Not applicable.
: The authors declare no potential competing interest with respect to the research, authorship, and/or publication of this article.