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Availability of data and materials
Authors agree to make data and materials supporting the results or analyses presented in their paper
available upon reasonable request.

Financial support and sponsorship
None.

Conflicts of interest
All authors declared that there are no conflicts of interest.

Ethical approval and consent to participate
This research was conducted in accordance with the Declaration of Helsinki and approved by The
University of Tokyo’s Review Board (No: 2158-10; January 19, 2023). Informed consent of patients for the
current study was obtained in the form of an opt-out on the website (http://www.u-tokyo-hbp-transplant-
surgery.jp/about/clinical.html).

Consent for publication
Not applicable.

Copyright
© The Author(s) 2024.

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