Funding for this research was provided by:
The Research Council of Norway (280431/GE)
The Norwegian Labour and Welfare Administration
Oslo Metropolitan University
NIHR Research Professorship (NIHR-RP-011-015)
Received: 2 June 2020
Accepted: 3 July 2020
First Online: 28 July 2020
Ethics approval and consent to participate
: The study protocol was submitted to the Regional Committees for Medical and Health Research Ethics for health research. They concluded that the study did not need approval by the Committee since the study does not generate new health research according to national regulations (2018/1326/REK sør-øst A). The study participants signed written electronic informed consents before participation in the study. The informed consent is attached to the protocol.
: Not applicable for this publication.
: Not applicable for this publication. We confirm that the study protocol has undergone peer-review organized by The Research Council of Norway.