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Article History

Received: 14 February 2024

Accepted: 24 April 2024

First Online: 28 May 2024

Ethics approval and consent to participate

: The study complies with the European Union General Data Protection Regulation standards, and the study has been registered at the North Denmark Region (ID: F2022-151). The regulation is supplemented by the Danish Act on Research Ethics Review of Health Research Projects. The authors showed consideration for the need for ethical approval, however for registry-based studies without direct patient encounters, the act reads that no approval is needed from an ethical committee. The requirement for informed consent to participate and to access medical records from individual participants was waived by the Danish Patient Safety Authority (IDs 3-3013-2707/1 plus amendments 31-1521-14 and 2022-011290).

: Not applicable.

: All authors have completed the ICMJE uniform disclosure form at and declare: VMLN had financial support from The Danish Air Ambulance Research Foundation for the submitted work. Outside the submitted work, EFC is supported by an unrestricted grant to her professorship [grant number 20046/aau] from the philanthropic fund TrygFonden to Aalborg University. Within the past 3 years, ARC has received financial support (NIHR Health Technology Assessment (UK)), and he has been a member of the Data Monitoring and Ethics Committee for the ASPIRED trial funded by BHF (charity) (no payment received). The remaining authors declare no conflicts of interest.