Article History
Received: 8 February 2021
Revised: 12 June 2021
Accepted: 29 June 2021
First Online: 30 September 2021
Competing interests
: The authors declare no competing interests.
: This study was approved by the Ethics Committee of Keio University Hospital (Approval number 20160084). Written informed consent for this study was obtained from all subjects. This study was performed in accordance with the Declaration of Helsinki.