Received: 28 April 2021
Accepted: 29 August 2021
First Online: 14 September 2021
: All participants gave written informed consent to participate in the study. The project group adheres to the Helsinki Declaration. SAMINOR 2 has been assessed by the Regional Committee for Medical and Health Research Ethics, North (2011/1840 and 2017/147) and the Norwegian Data Protection Authority (ref: 02/01525–4) and together with the SAMINOR Project Board, all have approved the study.
: Not applicable
: The authors declare that they have no competing interests.