Funding for this research was provided by:
Västerbotten Läns Landsting
Knut och Alice Wallenbergs Stiftelse
University Of Umea
Received: 17 June 2020
Accepted: 25 September 2020
First Online: 8 October 2020
Ethics approval and consent to participate
: Ethical approval was obtained from the ethical review board of Umeå University, reference number 2017-447-31. No specific consent to participate in the study was considered necessary.
: Not applicable.
: The authors declare that they have no competing interests.