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Article History

Accepted: 19 June 2023

First Online: 8 July 2023

Declarations

:

: MW received grants from the Swedish Research Council (VR) (grant number: 2016-01590), the Swedish Research Council for Health, Working Life and Welfare (Forte) (grant numbers: 2016-07097, 2021-00683) and the Swedish state under the agreement between the Swedish government and the county councils, the ALF agreement (ALFGBG-715841, 965525). The funders had no role in study design, data collection and analysis, decision to publish or preparation of the manuscript.

: Khedidja Hedna (KH) and Margda Waern (MW) declare that they have no conflict of interest.

: The datasets generated during and/or analysed during the current study are not publicly available due to the sensitive nature. According to the Swedish Ethical Review Act, the Personal Data Act and the Administrative Procedure Act, data can be made available after legal review for researchers who meet the criteria for access to this type of sensitive and confidential data. For questions about this, please contact KH (Khedidja.hedna@neuro.gu.se). Aggregated data may be available from Statistics Sweden or from the National Board of Health and Welfare upon request.

: The study was approved by the Regional Ethical Review Board in Gothenburg (no. 111-15) in accordance with national regulations.

: No consent was required as no patients were recruited. The study is based solely on national register data. All data were matched by Statistics Sweden and anonymised before delivery.

: KH designed and planned the study, organised data collection, participated in the analysis of data and interpretation of the results, and drafted the manuscript. MW is the principal investigator of the project. She acquired funding and contributed to data collection and interpretation, and she took part in the writing of the manuscript. Authors declare that they read and approved the manuscript prior to its submission.