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Article History

Received: 16 June 2025

Accepted: 25 August 2025

First Online: 26 September 2025

Declarations

:

: As a retrospective epidemiological study, approval by a scientific ethics committee is not required by Danish Law. The law in question is the Danish Committee Law Sect. 14, part 2 (Danish: Komitéloven paragraf 14, stk. 2) []. In Danish, it reads: ”Spørgeskemaundersøgelser og sundhedsvidenskabelige registerforskningsprojekter skal kun anmeldes til det videnskabsetiske komitésystem, såfremt projektet omfatter menneskeligt biologisk materiale.” In English (translated by the manuscript authors) it reads: “Questionnaire-based research projects and healthcare registry-based research projects are only required to be notified to the scientific ethics committee, if the project involves human biological material”. The study was approved by the Danish Data Protection Agency. As the databases used for this study fall under “Clinical Control Databases” (Danish: “Kliniske Kvalitetsdatabaser”), this study did not require informed consent from the participants in the database as per the Danish Health Law Sect. 196, part 4 [], which reads: In Danish: ”Indberetning af oplysninger efter stk. 2, der kan henføres til bestemte personer, kan ske uden samtykke fra personen.” In English (translation by the manuscript authors): “Registering information which can refer to specific persons, as per part 2, can be done without consent of the person”.

: Not applicable.

: The authors declare no competing interests.