Funding for this research was provided by:
Forskningsrådet om Hälsa, Arbetsliv och Välfärd (2014-4948)
Received: 7 January 2019
Accepted: 29 November 2019
First Online: 19 December 2019
Ethics approval and consent to participate
: Ethics approval for the study was obtained from the Regional Ethical Board in Stockholm, Sweden, no. 2014/1498–31/2. Participants gave written consent to participation.
: Not applicable.
: The authors declare that they have no competing interests.