Received: 2 September 2021
Accepted: 10 November 2021
First Online: 3 December 2021
: All authors declare that they have no competing interests.
: The study protocol was reviewed and approved by the institutional review board of Osaka University Hospital (No. 16260).
: Because of the anonymous and retrospective nature of this study and the personnel identifiers were removed beforehand from the JTDB database, the patients’ right to informed consent was waived.
: Not applicable.