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Article History

Received: 29 June 2023

Accepted: 4 September 2023

First Online: 12 September 2023

Declarations

:

: The local ethics committees of Bern and St. Gallen approved the study protocol (Ethics committee Bern: BASEC nr. 2020-01737, study nr. 4690 and St. Gallen: BASEC nr. 2020-01737, 20/122). The local ethics committees granted permission to use patient data without individual informed consent according to the federal act on research involving human beings and the ordinance on human research with the exception of clinical trials. The permission also covered the use of patient data regarding HEMS operations. The investigation was carried out in accordance with the Helsinki declaration and all relevant national guidelines and recommendations.

: Not applicable.

: The authors have no competing interests to declare that are relevant to the content of this article.