Straiton, Melanie http://orcid.org/0000-0001-6453-8051
Corbett, Karina
Hollander, Anna-Clara
Hauge, Lars Johan
Funding for this research was provided by:
Norges Forskningsråd
Article History
Received: 30 May 2019
Accepted: 28 November 2019
First Online: 9 December 2019
Ethics approval and consent to participate
: Ethical approval for this study was granted by the Regional Committee for Medical and Health Research Ethics, South East Norway (REK 2014/1970) and both registry owners approved the use of their data. Consent to participate was not required since this study uses already existing administrative data.
: Not applicable.
: The authors declare that they have no competing interests.