Hedna, Khedidja http://orcid.org/0000-0002-4642-4592
Fastbom, Johan
Skoog, Ingmar
Hensing, Gunnel
Waern, Margda
Funding for this research was provided by:
Vetenskapsrådet (2016-01590)
Forskningsrådet om Hälsa, Arbetsliv och Välfärd (2016-07097)
ALFGBG (715841)
Söderström-König Foundation (844351)
Article History
Received: 17 December 2019
Accepted: 11 May 2020
First Online: 16 June 2020
Ethics approval and consent to participate
: The study was approved by the Regional Ethical Review Board in Gothenburg (Ethical approval no: 111–15) in accordance with national regulations.No patients were recruited for this study as it was based solely on national register data. Statistics Sweden replaced the unique personal identity numbers after the final data linkage and data were delivered and analysed anonymously.
: Not applicable.
: The authors declare that they have no competing interests.