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Article History

Received: 8 December 2021

Accepted: 26 February 2022

First Online: 12 March 2022

Declarations

:

: This retrospective study involving human participants was in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The medical ethics committee of the MUMC + approved this study (METC 2020–1589) on July 28, 2020.

: The institutional review board of MUMC classified this study as non-WMO obligatory and allowed us to invoke the institutional “no objection regulation”, so no informed consent was obtained. Informed consent could not reasonably be obtained (the population included a considerable sample size, from which many patients have already died), and the data were encoded in such a way that deduction is prevented. The following points also apply:1. The research has a general interest, namely, to clarify the consequences of elective tooth extractions in head and neck cancer patients who will undergo radiotherapy. Results of this study may contribute to improve current policy;2. The research cannot be carried out without the relevant data extraction (from electronic health record (EHR): dental status, weight, etc.).3. The researchers checked the EHR and made sure that the subject has not made any objections against the use of his/her data for scientific research.4. A note has been made in the patients’ EHR stating that data has been provided for the present study.

: Not applicable.

: The authors declare no competing interests.