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Article History

Received: 20 September 2022

Accepted: 2 February 2023

First Online: 20 February 2023

Declarations

:

: The study was approved and the need for informed consent was waived by the Norwegian Regional Committee for Medical and Health Research Ethics (ref: 2018/795). According to Norwegian legislation, permission can be given to obtain and analyze de-identified data from registers without individual consent using data in existing health registers, when participants’ welfare and integrity are maintained. The NPR de-identified patients’ ID numbers before release in accordance with relevant regulations. The study and the Data Protection Impact Assessment (DPIA) were approved by the Privacy Ombudsman at Akershus University Hospital (ref: 2018–090). The authors assert that this work comply with the ethical standards of the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

: Not applicable.

: Rugkåsa is a member of the editorial board of BMC Psychiatry. Benth, Hofstad and Nyttingnes declare that they have no competing interests.