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The law in question is the Danish Committee Law Sect.\u00a014, part 2 (Danish: Komit\u00e9loven paragraf 14, stk. 2) []. In Danish, it reads: \u201dSp\u00f8rgeskemaunders\u00f8gelser og sundhedsvidenskabelige registerforskningsprojekter skal kun anmeldes til det videnskabsetiske komit\u00e9system, s\u00e5fremt projektet omfatter menneskeligt biologisk materiale.\u201d In English (translated by the manuscript authors) it reads: \u201cQuestionnaire-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\u201d. The study was approved by the Danish Data Protection Agency. As the databases used for this study fall under \u201cClinical Control Databases\u201d (Danish: \u201cKliniske Kvalitetsdatabaser\u201d), this study did not require informed consent from the participants in the database as per the Danish Health Law Sect.\u00a0196, part 4 [], which reads: In Danish: \u201dIndberetning af oplysninger efter stk. 2, der kan henf\u00f8res til bestemte personer, kan ske uden samtykke fra personen.\u201d In English (translation by the manuscript authors): \u201cRegistering information which can refer to specific persons, as per part 2, can be done without consent of the person\u201d.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not applicable.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare no competing interests.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"191"}}