Lillehagen, Mats
Isungset, Martin Arstad
Funding for this research was provided by:
University of Oslo
Article History
First Online: 15 September 2020
Compliance With Ethical Standards
:
: The authors have declared that no competing interests exist.
: Access to administrative register data was approved by The Norwegian National Committee for Research Ethics in the Social Sciences and the Humanities (NESH), the NSD Data Protection Services (Personvernombudet), and Statistics Norway. These data are de-personalized and range the full population.