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Article History

Received: 21 July 2023

Accepted: 6 September 2023

First Online: 17 November 2023

Declerations

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: We applied for ethical approval from The Danish National Committee on Health Research Ethics, but formal approval was waived. We received permission for storage of data and to use these for research of OHCAs in the Capital Region of Denmark by Danish Data Protection Agency (P-2021-670) and Danish Health Authorities (R-2005114). The study is registered at ClinicalTrials (NTC05113706). We further confirm that any aspect of the work covered in this manuscript that has involved either experimental animals or human patients has been conducted with the ethical approval of all relevant bodies and that such approvals are acknowledged within the manuscript.

: Not applicable.

: This study was supported by an unrestricted grant by the Danish Foundation TrygFonden and from The Laerdal Foundation. The funding sources were not involved in study design, analysis or interpretation of data. None of the authors reports grants or funding that could be perceived to influence or give the appearance of potentially influencing the submitted work. We confirm that we have given due consideration to the protection of intellectual property associated with this work and that there are no impediments to publication, including the timing of publication, with respect to intellectual property. In so doing we confirm that we have followed the regulations of our institutions concerning intellectual property.