Funding for this research was provided by:
Stockholms Läns Landsting (LS 2016-1448)
Received: 5 March 2019
Accepted: 17 May 2019
First Online: 24 May 2019
Ethics approval and consent to participate
: The study was conducted with the permission from the Regional Ethical Review Board in Stockholm (dnr 2017/205–31/5).
: Not applicable.
: The authors declare that they have no competing interests.