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Article History

Received: 23 January 2024

Accepted: 8 May 2024

First Online: 15 May 2024

Declarations

:

: This study is based on secondary use of clinical and administrative register data. According to the Regional Committees for Medical and Health Research Ethics (REK), the study was not in the substantive scope of the Health Research Act and approval was not required (REK reference 2017/1391/REK nord). Exemption from the duty of confidentiality was granted by REK for data from the CRN and NoPCR, by the Norwegian Health Directorate for KUHR-data and by the SSB for SSB-data. The data controller has carried out a data protection impact assessment (DPIA). The data protection officer was consulted and has concluded that the data processing was in accordance with the regulations. Data were received after applications to the CRN, the Norwegian Institute of Public Health, the Norwegian Health Directorate, and the SSB. Public access to this type of data is closed. According to Norwegian law, further ethical approval or obtaining informed consent was not required for this study. All methods were performed in accordance with the relevant guidelines and regulations.

: Not applicable.

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