Funding for this research was provided by:
Forskningsrådet om Hälsa, Arbetsliv och Välfärd (2014-0936)
Received: 19 March 2019
Accepted: 7 August 2019
First Online: 14 August 2019
Ethics approval and consent to participate
: Oral and written study information was given and informed written consent was obtained from all participants, including consent for linking records to registers during follow-up. The Regional Ethical Review Board at the University of Gothenburg, Sweden, approved the project with the reference number 125–15.
: Not applicable.
: The authors declare that they have no competing interests.