Funding for this research was provided by:
Norges Forskningsråd (204677/H10)
Text and Data Mining valid from 2019-10-16
Received: 15 May 2019
Accepted: 27 September 2019
First Online: 16 October 2019
Ethics approval and consent to participate
: Data for this study are provided by the Norwegian Directorate of Health. Since data are administrative data, ethics approval is not required. Permission to use Fig. InternalRef removed: Reference 19/284679-1 by Norwegian Health Economics Administration.
: Not applicable.
: The authors declare that they have are no competing interests.