Received: 27 August 2020
Accepted: 27 November 2020
First Online: 3 February 2021
Compliance with ethical standards
: The author declares no conflict of interest.
: 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 Helsinki declaration and its later amendments or comparable ethical standards. In this research, no animals were involved.
: All patients signed a written informed consent for radiation therapy and written informed consent for the use of the anonymized data for research or educational purpose.