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Article History

Received: 15 December 2025

Accepted: 12 February 2026

First Online: 23 February 2026

Declarations

:

: The study has been performed in accordance with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The study and the data linkages have been approved by The Regional Committee for Medical and Health Research Ethics (REC South East A), the Norwegian Institute of Public Health, the Norwegian Directorate of Health (Norwegian Patient Registry), and Statistics Norway. Data have been handled in accordance with the General Data Protection Regulation, and a Data Protection Impact Assessment has been performed in consultation with the Data Protection Officer at the Norwegian Institute of Public Health.

: The study is based on registries to which reporting is mandatory. For this type of study formal consent is not required. An exemption from confidentiality has been obtained in accordance with the Norwegian Act on medical and health research.

: Siri M. Solbakken, Ruth Aga, Sellan L. Matheswaran, Kristin Holvik, Tone K. Omsland, Cecilie Dahl, Christopher S. Nielsen, Anne Johanne Søgaard, and Haakon E. Meyer declare that they have no conflicts of interest.

: Data from the Norwegian Patient Registry have been used in this publication. The interpretation and reporting of these data are the sole responsibility of the authors, and no endorsement by the Norwegian Patient Registry is intended nor should be inferred.