Received: 19 September 2020
Accepted: 7 January 2021
First Online: 21 January 2021
Ethics approval and consent to participate
: The study protocol was approved by the Ethical Committee of the Nippon Medical School Hospital (B-2020-121) and designed in accordance with the Declaration of Helsinki. The study was registered to the University Hospital Medical Information Network (UMIN No.000041146).
: Not applicable.
: There are no conflicts of interest to declare in this study.