Funding for this research was provided by:
Västerbotten Läns Landsting
Svenska Forskningsrådet Formas
Received: 10 June 2020
Accepted: 4 May 2021
First Online: 14 June 2021
: The study was approved by the local ethics committee at Umeå University and all participants gave their written informed consent to participate.
: Not applicable.
: The authors report no competing financial or other interests.