Document is current
Any future updates will be listed below
-
Authors
Belfrage, Anna http://orcid.org/0000-0002-4962-2527
Grotmol, Kjersti Støen
Tyssen, Reidar
Moum, Torbjørn
Lien, Lars
-
Funding
Funding for this research was provided by:
Norwegian National Advisory Unit on Concurrent Substance Abuse and Mental Health Disorders
- License Information
-
More Information
Article History
Received: 2 August 2017
Accepted: 23 May 2018
First Online: 29 May 2018
Ethics approval and consent to participate
: The Longitudinal NORDOC study has been approved by the Regional Committee for Medical Research Ethics, Southern Norway, Section A: 2009/788a. A written consent was not needed on each approach (wave) of the survey, since to answer the questionnaire was regarded as being equal to giving such consent. However, in the 2014 wave (T4) we included sampling of saliva for genetic testing and linkage to a sick leave register that both required written consent (Approval 2013/1585 from the same Committee as above).
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
