Received: 9 September 2021
Accepted: 10 November 2021
First Online: 23 November 2021
: IRB approval: The ethics committee of Akita University Hospital granted approval for publication of the present study (No. 2641), and the need for individual informed consent was waived in this retrospective study.
: Consent of the patients was obtained through the written consent form of our institute.
: The authors declare that they have no competing interests.