Received: 22 December 2021
Accepted: 15 March 2022
First Online: 21 March 2022
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. The study design was approved by the ethics committee of Osaka International Cancer Institute (approval number 20096). All patients provided written informed consent for the use of their data in clinical research before the administration of radiotherapy and had the opportunity to opt out of the study.
: Not applicable.
: The authors declare that they have no competing interests relevant to this article.