Received: 13 January 2021
Accepted: 13 May 2021
First Online: 2 June 2021
: This study was conducted in accordance with the ethical principles of the Declaration of Helsinki 1964 as modified by subsequent revisions and Jikei University School of Medicine. The study protocol was reviewed and approved by the Ethics Committee of the Jikei Institutional Review Board, Jikei University School of Medicine (approval number: 29–143 8759). This study was also approved by the participating institution’s review board. All methods were performed in accordance with the relevant guidelines and regulations. After being informed of the experimental protocol, the written informed consent with an invitation letter was handed to each candidate on site.
: Not applicable.
: The authors declare that they have no competing interests.