Funding for this research was provided by:
Stockholms Läns Landsting (SOF)
Received: 27 February 2020
Accepted: 17 July 2020
First Online: 26 August 2020
Ethics approval and consent to participate
: The study was approved by the Regional Ethical Review Board in Stockholm, Sweden (2014/17–31/3) and followed the guidelines according to the Declaration of Helsinki. All participants received written and verbal information prior to inclusion and gave their informed written consent.
: Not applicable.
: The authors declare that they have no competing interests.