Correction to: Acta Neurochirurgica (2023) 165:145–157

https://doi.org/10.1007/s00701-022-05440-2

This study’s research protocol (#2014/1477) was assessed by the Regional Committees for Medical and Health Research Ethics (REK) to fall outside the scope of the Health Research Act and, accordingly, did not require approval from the ethical committees. The study was approved by the Data protection officer approval Oslo University Hospital (#18/10820).