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Article History

Received: 15 December 2019

Accepted: 3 March 2021

First Online: 20 March 2021

Declarations

:

: The study was approved by the Regional Committee for Medical Research Ethics (REC), Health Region IV in Norway (REC reference 2013/1348), and was in accordance with the 1964 Helsinki declaration and its later amendments. The study was approved with a waiver of informed consent for patients who were deceased. Furthermore, the study was approved with a waiver for informed consent for patients who were alive and had provided written, informed consent as a part of a different intracranial tumor research project at our institution. Patients who had declined participation in the previous research project were excluded. For patients who were alive and had not previously been asked for participation in any research project at our institution, the study was approved with “silent” consent, where the patient and/or the patient’s next of kin were to be informed of the study and could decline participation. However, there were no patients in the latter category.

: All authors certify that they have no affiliations with or involvement in any organization or entity with any financial interest (such as honoraria; educational grants; participation in speakers’ bureaus; membership, employment, consultancies, stock ownership, or other equity interest; and expert testimony or patent-licensing arrangements), or non-financial interest (such as personal or professional relationships, affiliations, knowledge or beliefs) in the subject matter or materials discussed in this manuscript.