Received: 5 July 2022
Accepted: 30 December 2022
First Online: 7 January 2023
: The Ethical Review Board of Chiba University Graduate School of Medicine approved this study (approval number: 3429). The review board waived the requirement for written informed consent from the patients or their guardians in accordance with the Ethical Guidelines for Medical and Health Research Involving Human Subjects in Japan.
: Not applicable.
: The authors declare that they have no conflicts of interest.