Svendsen, Vegard G http://orcid.org/0000-0001-5802-7482
Stavseth, Marianne Riksheim http://orcid.org/0000-0002-9324-6194
Skardhamar, Torbjørn http://orcid.org/0000-0002-5589-8570
Bukten, Anne http://orcid.org/0000-0003-0285-5339
Funding for this research was provided by:
University of Oslo
Article History
Received: 14 January 2023
Accepted: 18 May 2023
First Online: 2 June 2023
Declarations
:
: The study was approved by the Regional Committees for Medical Research Ethics South East Norway (2012/140) and was approved as exempt from informed consent. Data files were linked by The Norwegian Institute of Public Health, which also created and stored the linkage code. All the methods were carried out in accordance with relevant guidelines and regulations (such as Declaration of Helsinki).
: Not applicable.
: The authors declare that they have no competing interests.