Received: 7 June 2022
Accepted: 30 December 2022
First Online: 10 January 2023
: This study was approved by the institutional review board of the representative facility (Sapporo Medical University, No.292–183).
: Since this was a retrospective study, informed consent was not required for submission. On the other hand, the output of this study was posted on the website (ExternalRef removed) and we did not receive any inquiries.
: The authors declare that they have no competing interests.