Received: 29 June 2021
Accepted: 25 October 2021
First Online: 12 January 2022
: This prospective observational study was approved by the Sapporo University Hospital review board. All participants gave informed consent to this study.
: As part of the hospital treatment contract, informed written consent is obtained from all patients and/or their legal guardians for the use of their anonymized data for research purposes. No personal data is included in this manuscript.
: The authors declare that they have no competing interests.