Funding for this research was provided by:
Forskningsrådet om Hälsa, Arbetsliv och Välfärd (2016-07148)
Received: 23 January 2019
Accepted: 10 September 2019
First Online: 18 September 2019
Ethics approval and consent to participate
: The study was approved by the Stockholm Regional Ethics Committee (reg. no. 2017/34–31/5; 2017/684–32). The need for consent was waived due to the anonymised nature of the data material used.
: Not applicable.
: The authors declare that they have no competing interests.