Funding for this research was provided by:
Cancerforskningsfonden i Norrland
Västerbotten Läns Landsting
Received: 9 October 2019
Accepted: 7 September 2020
First Online: 15 September 2020
Ethics approval and consent to participate
: This study was conducted in accordance with the ethical standards outlined by the Helsinki declaration and its amendments or comparable ethical standards. This study was approved by The Regional Ethical Review Board in Umeå [Dnr 2016–345-31 and 2017–472-32 M]. Informed consent was obtained from all individual participants included in the study.
: Not applicable.
: The author(s) declare that they have no competing interest.