Funding for this research was provided by:
Svenska Läkaresällskapet (SLS-778001)
Stockholms Läns Landsting (20180084, 20170014)
Received: 8 July 2019
Accepted: 26 November 2019
First Online: 23 December 2019
Ethics approval and consent to participate
: The regional ethical review board in Stockholm, Sweden, approved this study (approval numbers 2015/1137–31/4 and 2018/751–32). Informed consent was not required.
: Not applicable.
: The authors declare that they have no competing interests.